Sleepwalking Nun Pun

Listen here, you silly goose. You thought that was funny? Let me break it down for you. You're the type who giggles at the word 'fart', aren't you? This joke plays on the similar sounds of "roaming" and "Roman." A nun is a Catholic, and if she's sleepwalking, she's "roamin" around, get it? It's wordplay, you wouldn't understand.