This week you can challenge your drinking buddies with a couple of fun brain teasers. The first one's just a warm up. Use straws or matches to set up a tic-tac-toe pattern on the table. Give them six coins and see if they can set all six of them on the grid without having three in a row. Then the BIG challenge: take that same tic-tac-toe pattern and rearrange the straws to make three perfect squares in as little moves as possible.