PhD Flopper

PhD Flopper is a perk first featured in Ascension. It lets the player drop a small nuke whenever they are downed or dive to prone from an elevated area (such as the top of a staircase or a ledge) and appears to reduce fall damage significantly, it also prevents any explosive damage. It costs 2000 points to buy and is a dark blue/purple color.

Location
PhD Flopper is located near the lunar lander that has the grenades to buy off the wall.

Trivia

 * The perk's name is likely to be a play on the name of the soft drink Dr Pepper.
 * If you dive into prone from a high distance with this perk on, then a small explosion will occur around you.Flopper_'splosion.jpg
 * The machine itself branches from the perk icon. While the other perks have machines that follow their color in glow and theme, PhD Flopper's machine glows yellow, whilst the perk icon is a dark blue/purple color.
 * The PhD Flopper seems to be made from Prunes. This is supported from Dempsey's Quote when drinking the Perk, "I hate Prunes!" This would explain its dark purple color.
 * Phd Flopper may possibly mean: "Personal Hit Damage Flopper" do to the fact you can't do any self damage.
 * This is the first zombies perk to directly effect the zombies.

Reference
http://uk.xboxlive.ign.com/articles/114/1144268p1.html