Fill a small glass full of liquid (yes, real liquid!). Hold the glass in your outstretched hand, placing it in full view on your palm. Cover the glass with your other hand- and then SQUEEZE your hands together- SQUASH! Your hands push flat together because the glass and the liquid are GONE!
No spills! It's self-contained! (You do have to wear a jacket, though).
This is a great idea for behind-the-bar bartender magic, either at home or in a professional setting.
This is so good that a famous magic company built their business selling this one trick! This trick, marketed by Percy Abbott as "Squash", was such a popular product that it helped launch the famous Abbott Magic Manufacturing Company.