-It's the food industry.
-not really feasible if you need to work full-time, unless you're a jack-of-all-trades, but this is kind of rare. Cashiers usually don't work on the line and vice-versa unless someone calls in sick.
-The training for working on the line and as a stretcher is a long process and not for the weak of heart. You only get trained on the line when it's slow, which is rare, and you're usually needed to do your job anyway. It's also kind of a male-centered environment. Females tend to only work as cashiers (which isn't too bad, as working the line is rather fast-paced and stressful).
-The owner watches the cameras. It's kind of weird.