Hey, I'm not sure if this would be considered exposure or not, it's an effect I sort of put together myself.
But yeah, here it is.
What you need, is to stack your deck, use any sort of stack you want. Use some sort of patter.
Ask them to think of any single card in the deck they want. now fan/spread the cards out in front of you so they can see the cards. ask them to remove that card from the deck and show it to everyone. Do a pass and look at the bottom card so you can tell what card they chose. Do some build up, then reveal.
The trick will reset instantly when you take the card back and put it on the top or bottom of the deck!
I'm not sure if this would be considered exposure since I invented the idea, but if it is I'll edit this post.