Start with 6 bottle caps or coasters and arrange them in a 'T' shape. Place 4 bottle caps in a straight line, and then place the other two caps on either side of the top cap.

The challenge is to make 2 rows of 4 caps each. However, you can only move one bottle cap.

When everyone's finished fumbling around, you can provide the very simple solution. Take the bottle cap from the bottom of your T-shape and place it on top of the bottle cap at the top.

Voila! You've made two rows of four.