Prepare a pair of prop playing cards with rough front and back, different colors, and the same color! Then find an audience member to come on stage! You hold the cards behind his back and ask him to randomly pick one card from the playing cards and let him show it to the audience. At the same time, you turn around (with your hands still behind your back) and quickly turn over the first and last cards behind your back. At this time, ask him to insert the cards back from behind you (he will definitely not be able to tell the difference and insert the cards backwards)
Then it depends on your touch! Quickly restore the first and last cards behind your back! Then one by one, it should be rough and different, and it is easy to find the cards that are placed in the deck! Show it to the audience now! applause! Flowers! Ha ha! Remember to like it after reading it!