Bus drivers.

London bus drivers are the most sadistic bastards on this earth. They don't stop half the time, they shove doors in people's faces without apology, they kick people off arbitrarily and decide where they're going to end the route rather than following it all the way to the end, even when they have to drive that way ANYWAY to turn around.
The other day, a blessed miracle happened. I ran for the bus and it stopped for me. This NEVER happens.
I get on, out of breath, and show my pass.
The bus driver starts yelling at me. "I wouldn't always stop!"
Well, no shit, asshole. Why do you think I said "thank you" when I got on?
Way to completely negate the nice thing you just did.