Z: Ok, so this guy had spent his whole life in a town with no trains, and he goes to visit a friend. He'd never seen a train or the tracks they run on, and one day he was just standing on the tracks when a train started to come by. The guy hears the whistle but he didn’t know what it was so he just stood there.
Z: Anyway, the guy just stands there and the train hits him.
GRUNION: Uh-huh. Hey, have you tried these muffins?
Z: Pay attention! The guy's in the hospital for weeks, and then he gets better enough to go back to his buddy's house. One night, the guy hears the tea kettle whistling and freaks out. He grabs a baseball bat and destroys the tea kettle! His buddy is like "WTF?" And the guy says, "Man, you gotta kill these things when they're small!" Get it?
GRUNION: Nope. I'm gettin another muffin.
Z: Hey! Have you heard the Acute Angina joke?