Dopefish is a commonly appearing easter egg in older video games, starting back in 1991. It was created by Tom Hall as a character idea for an episode of Commander Keen. It has appeared in various classic shooters, such as Doom II and Quake.
Dopefish is found in the Max Payne game, in a secret ammunition room whilst Max Payne is pursuing Vinnie Gognitti. It is found in the style of a poster, with the caption 'Dopefish Lives' in bold letters. Dopefish is seen wielding two handguns, seemingly similar to the 9mm handguns that Max Payne uses.