The Tick by Mago Flash from Spain is a mentalism tool that can be used as opener, or during a routine.
You ask the spectators to choose 7 or 8 items from any topic (could be celebrities, countries, music, etc.)
You write them on the board openly, as they call them.
Now ask them to THINK of one of the items, as you will predict it by placing a checkmark on one.
Leave the marker away, hands clean, they name which one they thought.
Professional made board on black leather.