Movie theater can be good, I was a ticket tearer, easiest job ever. Just don't get stuck at the box office during summer on a weekend, oh my God!
I worked at Vons (grocery store, a.k.a Safeway) for two years, that was my favorite job I ever had. I stock the freezers, it was great. I never had to deal with people, and the work was so easy. I met a bunch of girls there too.
I worked at UPS too, that was nice, but you have to lift a lot, it's very grueling, but you don't have to deal with the public, and you can wear whatever you want.