This effect always gets good reactions. Probably because of the surprise when they think you are about to do one amazing thing then you suddenly do something totally unexpected. When seemingly failing to make a coin vanish
from under a salt shaker, you slam the salt shaker with your palm and it slips straight through the solid tabletop.
This effect works because the salt shaker is covered with paper napkins; these napkins are able to hold the shape of the salt shaker long after it has gone.
While sitting at a table with everything in place (Saltshaker or glass, and paper napkins), ask someone if you can borrow a coin to do some magic. Say that you are going to make the coin disappear, and place it on the table. Cover the salt shaker with a napkin or two so they take on the shape of the shaker. Photo 1.