Dark magic

Tom: Dad, I learned a card trick off the Internet. Can I try it on you?
Dad: Oh God, do I have to?
Tom: Pick a card, don't show it to me.
*I pick 9 of clubs*
Tom: Now put it back in the deck. And cut the deck.
*Tom pulls out the 10 of diamonds*
Tom: Is this your card?
Dad: No. Definitely not.
Tom: Oh. You must have done that wrong.
Dad: No, YOU did that wrong. Great trick.