Discover the Object

Effect:
The magician is blindfolded, and then leaves the room.
A spectator points to something in the room.
The magician is brought back into the room, and asks somebody to point to 15 items, making sure the one thing pointed to by the other spectator is among them.
This is done, and the magician tells everyone what the spectator pointed to.

Setup:
In order to do this trick, you'll need somebody who is knows this trick to help you.

Begin by being blindfolded and escorted from the room. Have somebody point to something while you're out of the room.
Have your inside person remember what was pointed to. When you return, ask your inside person to point to 15 items. It can be any number actually.
While your assistant is pointing, they should point to a black object BEFORE they point to whatever the spectator pointed to.
Do not act any differently when you see the black object pointed to. Just make a note as to what was pointed to after that.
From there, you're all set to reveal your mind reading capabilities.