“You feel compelled to drink the coffee with no regard for temperature.”
Coffee is a beverage used to cure Hangovers in Problem Sleuth. The only coffee available in the game is in Problem Sleuth's office. When consumed, this removes the Hangover status effect. Since Hangovers lower your current Imagination level but not its maximum capacity, it's not terribly necessary to cure a Hangover with the small amount of coffee available in the game. It sometimes has precious candy corn in it.
Coffee is also found in Homestuck where it is produced by the coffee gadget which also gives it a strange unctuous film on the surface
.