When I was quite a bit younger, and before they had security cameras everywhere, me and my buddies did this to a McDonald's. I got a uniform for one of my buddies and he walked into McDonald's and acted like he worked there. He hung around behind the counter for a bit, mixing things around and talking to the other workers. Eventually, someone asked him to do something and he said, I quote "Fuck this job, I quit". He calmy walked out of the store. Not that funny really, but good.
