For someone who jokes around and is a general smartass as much as I am, it is almost impossible for me to tell when people are fucking with me IRL. It leads to many embarrassing encounters.
Walked into the office on a particularly windy day and a visiting client said "Love the hair" or somesuch and I was like "Uh, thank you!?" All the while I'm thinking have I seen this person before, I didn't do anything different to my hair, haven't had a haircut recently.
Yeah he was being a smart guy because the wind messed up my hair. I realized this like fifteen minutes later. He probably thought I was retarded.