I like the Seneca quote. I shall certainly use it.
My own twist on the DR quote is
"Tell me kid, you ever dance with John Major by the pale moonlight?"
Which I find more disturbing.
Although I do have a favourite question, like the hockey one. I was in Games Workshop, buying the new Gaunt's Ghosts novel, and myself and the staff are having this conversation about dice or something and these kids come in. They're about ten years old, and look (so far as I am any judge) pretty well turned out and confident, and this one kid butts in and says
KID: This stuff ...is it fun?
ASSISTANT: Yeah, it can be. There's a lot of different things to do.
KID: Is it cool?
ALL: *gazing around the room and at each other, then speaking in a kindly fashion* No. No it really isn't. If you want to be cool you need to turn around and walk away right now.