Movie Theater, Concesssion Stand. Worked there one day (as a teen). I Quit. They pay sucked and the job was just insane, complete boredom for about an hour, sitting behind the counter doing mindless crap, and then 30-40minutes of dealing with angry customers. I may have gotten used to it had I stuck it out, but, I had a second job and decided I didn't need to suffer.
I've had mostly good jobs, but I also quit Toys R Us pretty quickly. It was a grand opening, I worked at the store about a month or so before it opened. The management was really awful and I couldn't deal with the BS.