Every person has their final straw in the workplace, and oftentimes it's a seemingly small interaction that breaks the camel's back.
If you've endured whiny customers and condescending management for months upon end, then all it takes is one final jerk to inspire you to storm out and never look back. Even when you don't fully throw in the towel, there are negative work experiences that push your button so hard you express your real feelings, write-ups be damned.
So I quit my job waiting tables at Cheddars yesterday. It was a combination of not making any money, a horrible kitchen that tends to take their sweet a*s time with my food, everything in that store seems to be breaking, and I hadn't had a cigarette all day. But what set me off was one little kid, one bratty little scum-bag and his probably over pampering milf of a mom. I was walking by with my hands full of dishes when this kid shouts "Hey waiter!" and shakes his only half-empty lemonade at me and looks at me like I'm r*tarded, and his mom just smiles.