"How To Have Workplace Fun" joke

Find out where your boss shops and purchase exactly the same outfits. Wear them one day after your boss does. This tends to be especially effective if your boss is of a different gender than you.
Page yourself over the intercom without disguising your voice.
Send email to the other employees telling them exactly what you're doing. For example: "If anyone needs me, I'll be in the bathroom."
Sit at your desk and soak your fingers in Palmolive liquid. Call everyone Marge.
Whenever someone asks you to do something, anything, ask them if they'd like fries with that.
Encourage your co-workers to join you in a little synchronized chair-dancing.
Highlight your shoes, explaining to everyone that you haven't lost them as much since you did this.
Hang mosquito netting around your cubicle. When you emerge to get coffee or whatever, slap yourself randomly the whole way.
Send email back and forth to yourself, engaging yourself in an intellectual debate. Forward the mail to a co-worker, requesting he/she settle the disagreement.
Put your trash can on your desk and label it "IN".
Feign an unnatural and hysterical fear of staplers.
Send email messages saying there's free donuts, pizza or cake in the lunchroom. When people return to their desks complaining that they found none, lean back, pat your stomach and say, "You snooze, you lose."
Put decaf in the coffeemaker for three weeks. Once everyone has withdrawn from caffeine addiction, immediately switch to espresso.