Individual cartoons, originally published in the 80s in newspapers, like Family Circus. Artist is Gary Larson, strip is called The Far Side.

Mostly absurdist humor with some old references dotted in, like this one which references the stereotypical "cement shoes" mobsters used to send people to "sleep with the fishes." The phrase sleep with the fishes originated in the 1800s (or was first recorded then, anyway), but it was popularized by the movie The Godfather. The joke here is simply the opposite of that phrase, and the concept of a fish mafia.