I do the Card Warp to tell about how you can be changed when you invite God in your life. After showing that the card changes, I quote Paul who talks about "forgetting what is behind and straining towards what is ahead" (Philippians 3:13). I then tear the cards on the middle to separate "behind" from "ahead". This way I finish clean and nobody can find out how the trick was done.

I also use Card Warp very often. Using the idea of a complete change and the old life separated from the new. I've also seen a presentation using the Gypsy Thread as well.