Left 4 Dead 2

Someone on the official forums found a very special Infected while browsing the population.txt file: common_male_jimmy, otherwise known as the Infected version of Jimmy Gibbs, Jr, the famous Super Cup racecar driver from Dead Center!

The Infected model, which has no known placement naturally in the game, has a thousand health, no gibs, and a set of unique dialogue reactions from the Survivors, including:

* “Sorry about this Mr. Gibbs, but we need your car.” ~ Coach
* “HEY! Jimmy Gibbs!” ~ Coach
* “HEEEEEEEEEEEEEEELLLLLLLLLLLPPPPPPP!” ~Ellis
* “Dibs on Gibbs.” ~ Rochelle
* “God damn that Jimmy Gibbs Jr.!” ~Nick

To spawn him yourself, use these commands:

map
sv_cheats 1
z_forcezombiemodelname common_male_jimmy
z_forcezombiemodel 1
z_spawn

source