This is Bennie Chickering’s go-to trick. Not sure how you’d even follow it up. It’s a 2-phase miracle.
2 cards are selected and SIGNED. Then you TEAR BOTH CARDS IN HALF.
Phase 1: You restore both torn cards.
Phase 2: Then you fuse them back together with the wrong half! And here’s the craziest part, THEY GET TO KEEP BOTH CARDS.