PhD Flopper :)

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, Moon, Cell Block, and Origins. PhD Flopper also makes an appearence 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.