What I do at work when there's nothing to do

Last night, I was scheduled to work as a barback, which is basically a general go-fer, factotum, man-of-all-work for a bar or beverage department. Barbacks make sure that bartenders don't run out of anything they need (that's the main job), take out the trash, polish the carts, recieve deliveries, stuff like that.

If there's ANYTHING going on that the beverage department is involved with, they try to have a manager on duty, to resolve any significant problems, and a barback, to handle, well, all the simple things. So they had me on duty. Even though nothing, really, was happening.
( So, what was happening? Or wasn't? )