Describe Derailed for Details here.--OK. A character is trying to...What's his name? --Uh, Bob. Bob is trying to tell a story...Which story?--It doesn't matter! Shut up and let me finish! Ahem. Bob is trying to tell a story or joke, or ask a hypothetical or rhetorical question. He's interrupted constantly by requests for unnecessary extraneous details, quickly derailing the story into a Shaggy Dog Story or a Metaphorgotten. Common culprits are the Constantly Curious, the missing-the-point Cloudcuckoolander or the Mouthy Kid who's just trying to get on his nerves. Alternatively a self-conscious joke teller might do this to himself, adding unnecessary detail or going back and changing things.