Set the Block Escape Box, 6 colored blocks, and the wooden pen out on a table.
Have your spectator choose by touch two of the colored blocks. Load the blocks back into the box, close the lid and have your audience member confirm, through the holes in the lid, that all 6 colored blocks are in the box.
Gently slide the wooden pin from one end to the other through the box. Explain that the box will be able to tell which blocks they touched.
While holding the pin, one side in each hand, turn the box upside down. The two blocks that your audience member touched will amazingly fall out.