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PhD Flopper

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(PhD) Night-time scene. (PhD) The streets are mean. (PhD) The things I have seen. (PhD), the good, the bad, and the in-between. When you dive to prone, you are surely gonna own, PhD (Flopper)! When you dive to prone, it's gonna shake ya to the bone, all the zombies gonna groan, 'cause of PhD! (PHD) The feelin's growing strong. (PhD) So right that it feels wrong. (PhD) Like the chorus of a song. (PhD) Not short but not too long. Slap your body to the floor, everybody needs some more, of your lovin', your explosive lovin'. When you dive to prone, it's gonna shake ya to the bone, all the zombies gonna groan, cause of PhD! (PhD) (Flopper)! Damn straight.
— The jingle of the PhD Flopper.
PhD Flopper
PhD Flopper Machine Render
Nickname(s) Flopper
Games of appearance Call of Duty: Black Ops
Call of Duty: Black Ops Zombies
Call of Duty: Black Ops II
Maps of appearance Ascension
Call of the Dead
Die Rise (seen only)
Mob of the Dead (seen only)
Cell Block
Buried (Persistent Upgrade)
Cost 2000
Jingle genre Funk
"It has Doctor in the title... Just like me!"
Edward Richtofen

PhD Flopper is a Perk-a-Cola featured in Zombies. It was introduced along with Stamin-Up in the map Ascension and returns in Call of the Dead, Shangri-La, MoonCell Block, Buried and Origins. PhD Flopper also makes an appearance in part as a Persistent Upgrade on Buried as well as an unobtainable Easter Egg on the maps Die Rise and Mob of the Dead.

The Perk-a-Cola costs 2000 points and it has a dark blue and purple color scheme. The color of this perk is purple, and the icon is a nuclear symbol. PhD Flopper completely negates self-inflicted damage; however, the player will still groan and suffer temporary movement reduction when falling down from an elevated area. Another feature of this perk is that when players dive to prone from a height from which they would normally take damage, a 7.5 meter radius explosion is created upon landing. 

The explosion is very powerful, with a maximum of 5000 damage at the center of the blast, and can kill zombies with one hit up to approximately round 20. Between rounds 20 to 30, PhD Flopper will begin to make crawlers, and on rounds beyond 30, zombies will retain their legs even in the center of the blast. The perk is made from prunes and some types of chemicals. However, as this is an explosive "weapon", it should be noted that the player only receives 50 points per kill, when opposed to the 60 points that are acquired by using a bullet firing weapon, so using a gun would be advised if the player is going to buy something, such as other Perk-a-Colas. This perk does not seem to work when diving right on top of multiple zombies. It should also be noted when "flopping" that landing on a prone player while diving to prone will cause both players to be downed instantly, so one should avoid other teammates while diving.


Call Of Duty: Black OpsEdit

  • Ascension - Across from the Lunar Lander (closest to MP5K), with the grenades available to purchase off the nearby wall.
  • Call of The Dead - In the abandoned second floor of the multi-story building that branches off of the lighthouse.
  • Shangri-La - Will spawn randomly in the mines. (changes spawn with Stamin-Up, Double Tap and Deadshot Daiquiri).
  • Moon - Spawns on the far right side in the Bio-Dome near the Mystery Box spawn.

Call Of Duty: Black Ops IIEdit

  • Die Rise - Unobtainable Easter Egg in the first elevator shaft from the spawn room.
  • Mob of the Dead - Found on a small boat along with Mule Kick near the dock area as an unobtainable Easter Egg.
    • Cell Block - Found in the corner of the library, in the same location as the Olympia. Next to the spawn room in Mob of the Dead.
  • Buried - Available as one of the Persistent Upgrades.
  • Origins - Obtained via the Der Wunderfizz machine.


The PhD Flopper machine is very thin, and is covered in blood. It has a yellow paint job (which later changes to purple) on the front of the machine. There are 4 levers, from up to down, coloured red, green, white and purple. Under them, a bottle dispenser with a coffee cup in it can be seen. Under that, the words "Flopper PhD" can also be seen. On the top of the machine, the PhD Flopper shield can be seen, with several rods with yellow spheres stick out of it.

Call of Duty OnlineEdit

PhD Flopper appears in Cyborg Rising mode of Call of Duty Online, translated as Armor Cola. It is exclusive to the character Sergeant, and is awarded to the player after surviving three rounds.



  • PhD Flopper can negate the electric effects on the Wunderwaffe DG-2 in Call of the Dead, although this weapon isn't an explosive weapon.
  • Diving on top of zombies or a teammate with PhD Flopper will negate its explosion effect. This can actually prove to be lethal, as failing an explosion while a zombie horde is approaching can lead to the player being swarmed and downed since they are stuck in prone for a little bit and can't escape very quickly.
  • The Perk-a-Cola's name is a parody of the popular soft drink Dr. Pepper.
  • PhD Flopper is made from prunes and chemicals.
    • The drink has some prunes that are not a liquid, but in chunks, with some characters complaining about "eating" the drink.
  • PhD Flopper and Deadshot Daiquiri are the only Perk-a-Cola machines with jingles that directly mention the zombies.
  • The perk allows the player to overcook a grenade without dying.
  • One can see an empty styrofoam cup in the deposit of the machine.
  • You can hear someone sniff at the end of the song.
  • PhD Flopper will not protect players from the explosions caused by Napalm Zombies, as this doesn't count as suicide damage.
  • PhD Flopper is widely viewed as one of the best perks in terms of protection, second only to Juggernog.
  • In Call of the Dead and Shangri-La, the color scheme has been slightly changed for the Perk-a-Cola machine.
  • In Moon, diving to prone will not trigger the explosion in low gravity areas as the explosion is made when diving to prone from a height that would hurt the player and there is no fall damage in low gravity areas.
  • PhD Flopper has the longest jingle out of all the Perk-a-Colas.
  • This perk in the Russian version is "Доктор бумс" ("Doctor Booms").
  • Even though the player needs to dive to prone to initiate the explosive effect of the perk, one exception to this is when the player goes prone on the Flinger and is flung to the other side, which activates the explosion upon landing.
    • Similarly, in Buried, a player that goes to prone on a Trample Steam will be flung and will create the explosion where they land.
  • The PhD Flopper's jingle is in the style of Funk.
  • Cell Block is the only Call of Duty: Black Ops II map to date where PhD Flopper can be obtained from the Perk-a-Cola machine.
  • Its machine model looks different in Call of Duty: Black Ops II, it has a faint glow, whereas in Call of Duty: Black Ops, it is non-luminescent.
  • In Cell Block the bottles for PhD Flopper retain their older Call of Duty: Black Ops model not featuring the perks' logo around the neck of the bottle. This is corrected in Origins however.
  • When PhD Flopper is bought in Cell Block, a phasing variant of its jingle can be heard. It sounds similar to the line "PhD" being sung by the background singers.[citation needed]This can be heard with the other perks around the map, with different variations depending on their jingles.
  • In Origins, when the player dives to prone using PhD, if the player has the:
  • In Origins, the dive to prone damage is decreased by almost half.
  • This Perk-A-Cola machine is the tallest one out of all of the other ones, making Deadshot Daiquiri the shortest Perk-A-Cola machine.
  • The jingle of PhD Flopper lasts for 1 minute and 15 seconds, The same number for Element 115. This is shared with Stamin-Up.
  • It is featured in Buried as a Persistent Upgrade. It is obtained by taking a certain amount of fall damage (around 5-10 times). The best way to do this is by jumping down the staircase by the first box spawn many times until a green flash happens.

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