Best noise making ideas!
The big-mouth miller lite bottle worked great. Bought the beer, got a few dollars or quarters, and good to go.
The beer sellers with the carts seemed to leave the caps sitting in a pile. Just grabbed one, screwed it on, and made lots of noise. I actually used one of them up and had to change out the bottle in the 4th quarter.
It is loud enough to make a difference without aggravating everybody around you.