A spectator checks that the magician's pocket is empty.
Over a hundred different drinks are suggested.
The spectator chooses one of them. His choice is perfectly free.

A shot glass full of liquid appears in the magician's pocket.
The spectator tastes the drink: it's the one they chose!

Everything can be examined.

Supplied:
The deck of drinks cards
The shot glass
The gimmick
Online video instructions

Strong Points:

Very mystifying
An original effect
Easy to do