Lapse jokes
Grandpa: "Sonny, let me tell you something. There's only one damn thing in this whole world worse than Alzheimer's."
Boy: "What's that?"
Grandpa: "What's what?"
What is the difference between cunnilingus and a confused Parisian tourist?
One lapses into French, the other Frenches into laps.
Why couldn’t most people remember 9/11? Because it flew over their heads.