I'd like to think of myself as the kind of person who can handle negative/mean people pretty well. Granted I am kind of anti-social, but I can be social when I want to be. However, being a cashier and being exposed to several mean/negative people right in a row when you're trying your best to be a nice person and make sure their check out is going smoothly, almost makes it a little too much. Granted, I got over this feeling and decompressed on my break, but it's certainly not everyone's cup of tea.
Standing for a really long time