Accidently Pissing People Off

Nothing is better than pissing people off by accident. Today this guy in front of me was trying to parallel park and I stopped so he could get in the spot. But I didn't realize I had my signal light on, so he thought I wanted the spot too. So he just sat there, got pissed off I'm sure, and finally drove up and went into a different spot. When I drove past him, and he saw that I didn't even want to park in the original spot, he was PISSED. I didn't even try to piss him off, I was trying to be courteous. It was an accident.