I was once held at gunpoint over a 6pack of crunch donuts. I caught a guy cutting catalytic converters out of cars, and he then proceeded to chase me with a Sawzall. I watched an elderly man get run over by his wife and as i was rendering first aid he died. A homeless man once took a boxcutter from a grocery store employee, held it to his neck and said "watch me die".

None of those were my worst day at work though. My worst day was a 16 hour shift where I had to sit in a cubicle, with no phone, tv, or ac. I was staring at a monitor showing a camera feed that was only showing a door. It was just me, alone, and bored and cold and miserable for 16 hours. I like to think that's what the CIA did to people in the 60's to mentally break them.