Two teams of four racing. THEN the real race is to undo it. Pick your participants carefully, equal number of short pants vs. long pants. Four teams of two. One person holds a mug over their head.
Second person stands behind and pours beer or water into mug.
First person says stop when they think it is full. Fullest mug wins. Be ready to towel up the spillage. I did 384 shows last year reuniting adults with their childhood. It is all in how you set it up, how you intro it.