Office High Jinks

So I'm at work the other day and my co-worker, Jen, IM's me (she's working from home that day). She says it's silly, but thinks she lost her earmuffs. They possibly fell behind her desk and she wanted me to go look for them. I go back there, check under her desk and come back to write:

"Nothing there. Hey, did I just go muff diving?"

She replies: "BOO!"

And the planet shook.