Just saw a street magic on YouTube, I would like to learn it and perform to my friends. I know is not good to expose other's trick. But I want to know the methodology behind. 1. The magician spread the card face up 2. The magician let the spectator to pick a card 3. The magician shuffles the card and even pass the deck to spectators to shuffle. 4. The magician shows the card face up to say it's shuffled 5. He put some cards to the bottom of the deck and start spreading allowing the spectator to stop anytime. I don't know if it is appropriate to ask about a trick in this way, please let me know. Or you can simply give me some methods to perform similar effects.