[NSFW] What do you do when you're caught in the act at work (details inside)?

I’m sorry… I just couldn’t resist, considering the uprising of NSFW questions today.

You’re at work. You’re supposed to be working. And, you’re ___________ (fill in the blank with anything you’re not supposed to be doing at work). Just then, your boss walks into your office or cubicle area. What do you do?