I've searched the effyeahnerdfighters site, I've used my google-fu to the max, I've gone back and rewatched quite a few videos I thought it might be and I can't find it.
Hank asks her to tell the joke, and it's something like "What time does Sean Connery play tennis?" and Katherine answers "Oh, about tennish." in a Sean Connery accent. It's fantastic.
Help me find it?