Notes for show workers: Do NOT stand under heavy objects being lifted. Be sufficiently far away from the object so that if they fall to the ground you will not be struck by it. for vertically oriented objects, be outside of the height of the object so if it falls over you will not be crushed by it. Secure your loads and double-check them.
OSHA Information regarding forklifts:
Forklift Safety Guide (State of Illinois):
And a safety video (be patient - it starts out slow and builds to a really amazing ending):