Pour a small amount of salt on top of the bar then pour a little pepper on top of it. Challenge your victim to remove the pepper without touching the salt.

Solution:
You need a plastic comb for this one. Take your comb and either comb your hair or rub it vigorously on some cloth (bar rag, t-shirt etc.) in order to generate enough static electricity. Hold the comb over the pepper and watch it jump to the comb. Remember, this trick uses static charges so you have to have the right conditions. The cloth generates more static than others. Humidity can have an effect. The charge could be discharged before you get to the pepper if you touch metal or other wise ground yourself. If the conditions are right you could win yourself a free drink.