I'm wearing a collared shirt with a tie today because I'm doing some on-site consulting for work. This is a departure from the normal dress around here which usually consists of jeans and some kind of collared shirt. What I hate, though, is what everyone asks me when I'm dressed up like this and am in the office.
"So, you going to a job interview?"
Yes, I'm so oblivious to social convention that I though it would be a good idea to go a clandestine job interview and then appear in the office looking totally out of place. Because, obviously, a job interview is the only reason anyone would ever dress up nicely. It's not like anyone goes to weddings, funerals, client sites or anything else that requires attire more formal than "two steps above weekend slob".
Seriously, the "joke" isn't funny. Don't use it.