Coworker 1 is dressed as Freddy Krueger. Coworker 2 is tired.
Coworker 1: Wake up! You need to wake up. Coworker 2: No, I don't want to. Me: Coworker 1, you don't want her to wake up because then you can be in her dreams. har har har Coworker 1: Huh? Me: You're Freddy Krueger....
I always miss the joke and even I would have gotten that one. Nightmare on Elm Street was the scariest movie I've ever seen. If someone dressed as Freddy in my office I probably wouldn't sleep for a week.