I called my boss the other Monday and told him I needed the day off because I was sick. He said, "How sick?"
I said, "Well, I'm in bed with my 12-year-old sister."
Listen up, dummy! This "joke" is messed up. The dude calls his boss to say he's sick, but then he implies he's doing something real nasty with his little sister. It's supposed to be funny because it's taboo, but it's just plain wrong. People who laugh at this are probably the type to wear socks with sandals. Just saying.