Steven Shaw a.k.a. Banachek
The mentalist talks about a deceased uncle, and how his ghost is still alive and in the room at that very moment. One spectator is seated and another spectator is stood across the room. The mentalist taps the standing spectator on the shoulder twice and the seated spectator feels the taps. That's right, the seated spectator actually feels two solid taps on their shoulder despite nobody being near them, proving that the uncle's spirit does indeed exist!