Dan: How come you never laugh at anything I say?
Sally: Say something funny and I'll laugh.
Dan: Okay. How's this? Knock-knock.
Sally: Who's there?
Dan: I'm miserable every waking second!
Both: HA HA HA HA HA!

Dan: Are you guys learning the foxtrot?
Sally: What?
Dan: The foxtrot.
Sally: Foxbot?
Dan: Foxtrot.
Sally: Well, the first two times you said, "foxbot."
Dan: Yeah, honey, they're talking about ballroom dancing and I was talking about the mythical half-fox, half-robot.
Sally: You're an idiot.

...many more to come. ~_^