You show to the spectator a single torn playing card.
Maybe they will think that you're gonna perform Torn & Restore effect, but you show them something different.
With a gentle shake you make the torn visually move to another corner.
It's look like a trick photography until you hand out that card as a souvenir.
This is an effect designed for those of you who want to play a quick visual effect anywhere.
Easy to do and easy to get people's attention.