I like to read the dare, close my eyes and envision myself, or John Cleese as Basil Fawlty, doing said dare.
Put someone else's name on your lunch bag then prominently display the bag while you're eating.
With everything you say all day, roll your eyes.
When someone hands you a form or an envelope, caress it and whisper huskily, "Mmmmmmm. Yes, I've been expecting this one."
Give a colleague an unlabeled prescription bottle filled with mints or candy, and instruct them to withhold the "pills" no matter how hard you beg.