"Ever see any card tricks? Here's rather a good one; pick a card."
"Thank you, I don't want a card."
"No, but just pick one, any one you like, and I'll tell which one you pick."
"You'll tell who?"
"No, no; I mean, I'll know which it is don't you see? Go on now, pick a card."
"Any one I like?"
"Yes."
"Any colour at all?"
"Yes, yes."
"Any suit?"