I had a similar thing happen at work once. I signed a pile of checks, then they go to different supervisors depending what day was their turn to co sign them. So I looked at the schedule, and put the pile of checks on this guys desk. He was on the phone so he didn't aknowledge me. I go back to my desk, doing my thing...and he comes over and throws the pile back at me spewing them all over the floor!
I just left them there. My supervisor was watching the whole thing and she picked them up. "Whatever"
Good for you for having some self respect and quitting. The sad thing is, as long as the store is making money, the asst. manager probably isn't in any danger of losing his job, but definitely write a calm, professional letter explaining what happened and send copies all the way up the ladder in Pizza Hut. I feel bad for your friends still working for the pr*ck.