What I mean is the kind of thing that would make you say that without question this person is the really-truly if they know/can do/will do.
Basically, (think it if you won't say it...)

You may or may not give the answer, it's your decision. This is just for fun and all.
My go first.
What song did we label as "The Pizza Song"?

7839445 I'd ask, "What would the Pantyhose Warrior say?"

7839451
See? Nobody knows the context of the joke and we can all have a laugh anyway!