"Seeing pink elephants" is a euphemism for drunken hallucination caused by alcoholic hallucinosis or delirium tremens. The term dates back to at least the early 20th century, emerging from earlier idioms about snakes and other creatures.
"Pink Elephants on Parade" is a song and scene from the 1941 Disney animated feature film Dumbo in which Dumbo and Timothy Q. Mouse, having accidentally become intoxicated (through drinking water spiked with champagne), see pink elephants sing, dance, and play musical instruments during an hallucination sequence.
You start by asking "How many pink elephants are in this room?" The participants guess until you reveal that the correct answer, which is 8.
PINK ELEPHANT on Steam. PINK ELEPHANT is a 2D shooter with a top view whose task is to clear all the rooms from enemies and move to a new room, which in turn will bring you closer to the final of the game.