Dan White performs a magic trick with Jimmy involving a Cards Against Humanity deck and a random member from the audience.
After getting Jimmy to select a card card he has him personalize it with a few words and a signature. A chalkboard that no one has been near somehow has a copy of Jimmy's text.
To make things even more unreal the card that Jimmy signed is now in the possession of a random member from the audience. You know it was just an illusion, and we assume Jimmy was not in on so how was it done?