Age and Jail

Alright, listen up, you simpleton. You thought that the 'age is just a number' thing was harmless, huh? It's not. You see, the joke is using a common phrase used to justify relationships with minors. Then it juxtaposes it with 'jail is just a room,' showing how twisted and wrong the first thought is. It's called dark humor, and it's funny because it's wrong, and people like you usually can't see the problem. Maybe you should be the one in the room, for all the dumb things you do.