Dopefish

The Dopefish is originally an enemy from Commander Keen IV, designed by Tom Hall, a large green fish, prominently bucktoothed. Easter eggs referencing the character were common in Apogee Software games, and have since become an industry wide in-joke. The dopefish itself, or the sentence "dopefish lives!" have appeared in Quake, Quake II, Rage, Daikatana, Anachonox, Duke Nukem 3D, Descent, Kingpin, Max Payne, Deus Ex: Human Revolution, and more.

Doom (2016)

 * Take-out boxes of "Dopechan Noodles" can be found in various areas of the Mars base.

Doom Eternal

 * The chainsaw is identified as a "Mixom Bucktooth Dopesaw".
 * One of the books in the Fortress of Doom is entitled "From Nopefish to Dopefish: A Dope Tale"
 * Three giant dopefish can be found in the Cultist Base. The first is hanging from a rope, the second is stuck in a cracked ice wall, and the third is placed on an altar is a little evil shrine.

Community mods

 * Depicted on a wall in E3M7 of Doom the Way id Did.
 * The dopefish appears as a boss monster in MAP32 of Doom 2 the Way id Did.
 * Found on a wall in Z1M4 of Knee-Deep in ZDoom.
 * Referenced in E3M2 of ZPack.
 * The "Dopefish lives!" message is seen on a graffiti in MAP12 of Hellcore 2.0.