Bart: [to himself] Look, Homer won't want to go, so just ask him and he'll say "No." Then it'll be his fault.
Homer: [to himself] I don't want to go, so if he asks me to go, I'll just say, "Yes!"
Homer's brain: Wait! Are you sure that's how this sort of thing works?
Homer: Shut up, brain, or I'll stab you with a Q-tip!
Bart: [through clenched teeth] Dad, I really want you to come on this trip with me.
Homer: [through clenched teeth] Bart, I'd be delighted to go on your trip with you.
Bart & Homer: D'oh!