Run one lap around the office at top speed.

Ignore the first five people who say 'good morning' to you.

Phone someone in the office that you barely know, leave your name and say 'Just called to say I can't talk right now, Bye.'

To signal the end of a conversation, clamp your hands over your ears and grimace.

When someone hands you a piece of paper, finger it, and whisper huskily, 'Mmmmmmm, that feels soooooo good!"

Leave your zipper open for an hour.  If anyone points it out, say 'Sorry, but I really prefer it this way.'

In the middle of a meeting, suddenly yell out 'YAHTZEE!'

Walk sideways to the photocopier.

While riding in the elevator, gasp dramatically every time the doors open.

Say to your boss, 'I like your style', and shoot him/her with double-barreled fingers.

Babble incoherently at a fellow employee, then ask 'Did you get all that?, I don't want to have to repeat it.'

Page yourself over the intercom (do NOT disguise your voice).

Kneel in front of the water cooler and drink directly from the nozzle.

Shout random numbers while someone is counting.

At the end of a meeting, suggest that, for once, it would be nice to conclude with the singing of the national anthem (extra points if you actually launch into it yourself).

Walk into a very busy person's office and while they watch you with growing irritation, turn the light switch off/on 10 times.

For an hour, refer to everyone as 'Bob.'

Announce to everyone in a meeting that you 'really have to go do a "number two."

While an office mate is out, move their chair into the elevator.

In a meeting or crowded situation, slap your forehead repeatedly and mutter 'Shut up, damn it, all of you just shut up!'

At lunchtime, get down on your knees and announce 'With God as my witness, I'll never go hungry again!'

In a colleague's daytimer, write in 10am: 'See how I look in tights.'

Carry your keyboard over to your colleague and ask 'Do you wanna swap?'

Repeat the following conversation 10 times to the same person:
'Do you hear that?'
'What?'
'Never mind, it's gone now.'

Come to work in army fatigues and when asked why, say, 'I can't talk about it.'

Speak in an accent (French, German, Porky Pig, etc) during a very important conference call.

Hang a two-foot long piece of toilet paper from the back of your pants and act genuinely surprised when someone points it out.