chopsticks - clap your index fingers together.

fireworks - mime striking a match and lighting the fuse saying "Hisss" as it
                   burns.  Say "ssssssss" as it flies in the air.  Watch and point as it
                   goes.  Yell "BANG" as it explodes, moving your hands apart
                   to show how big.  Whisper "ssssssss" and wiggle your fingers as
                   the sparks float down.

oriental bow - put your palms together, fingers pointing up, and bow from the
                       waist.