We all have those days where it takes every ounce of our self control not to blow a gasket. If you work in customer service, or in any field where you work with people, it's infinitely harder to make it through those days without completely melting down. The good news is, there is a solution: a very kind, cordial, professional way to say exactly what you wish you could.
Guys, it took me way too long to get my love life together. I don't learn. You ever have one of those relationships where you know everything that's happening is messed up but you still don't leave? I had a dude dump a bowl of popcorn over my head at a restaurant once. Think I left? Nope. I married him.