Required Items: 2 shot glasses, water, and straw.
Set-Up: Place the shot glasses lip to lip and submerge them in a sink of water. Fill both and place on the bar.
Trick: To get the water out of the top shot glass, while keeping both glasses lip to lip.
Rule: Bar-Fly may not touch either glass physically with anything.
Solution: Blow on the seal of the glasses to displace the water with air blown from the straw. Get out the bar rag.