In my table hopping act, I rarely open with a card trick. One evening, a lone couple beckoned me to return for an encore. I proffered a card effect and they gladly accepted.
I shuffled, spread, and asked the gentleman to select a card, memorize it, and show it to the lady. Meaning to control his selection, I held out half the cards, gesturing for him to place his card on top of the half...that's when I LOST CONTROL.
He grabbed my half-deck, shoved his card into its center, and began to shuffle, with a knowing smurk on his face. I stopped him and said, "You're only using half of the cards! Here, take these (handing him the rest of them), and continue suffling". Meanwhile, I was cooking up a suitable out. I truly didn't know what his selection was. As he continued to shuffle, I said, "No matter how much I beg or plead, DON'T tell me what your card is". He agreed with an arrogant grunt. (I was going to get him to reveal the card to me outright.)
When he was satisfied (and still smurking) he handed me the deck. His (date) was glaring at him. I asked, "Since you did all the shufling and cutting, and I didn't touch your card, do you think it would be a good trick if I somehow influenced you to shuffle it to the top of the deck?" "Sure would!", he replied with a snort.
I lifted the top card as if to turn it over, and commanded, "Name your card, sir!" As (my) good luck would have it, his card was the top card (What are the odds?). I let it fall gracefully face up on the deck, and congratulated them for a fine dining experience.
I'll bet, to this day, that man is still thinking, "How the..."