Chopstick Superstitions: "If you find an uneven pair
at your table setting, it means you are going to miss a boat, plane or
train. Dropping chopsticks will inevitably bring bad luck.
Crossed chopsticks are, however, permissible in a dim sum
restaurant. The waiter will cross them to show that your bill has been
settled, or you can do the same to show the waiter that you have finished
and are ready to pay the bill." China
Daily