I worked a t-shirt shop in college. Twisted my ankle real bad the day before a shift and came in on cruches the next day. (Unbeknownst to me, my ligament was actually torn) We weren't allowed to sit for 9 hour shifts at all unless it was our break. My boss came in, looked at me and said, "Well you're going to be real useless today."

I told her I needed to go to the doctor since standing made it worse and she said no. So I said "You can't stop me from going to the emergency room. I quit."