Write a message on an upside-down paper cup that alludes to something horrible being trapped under it. Leave it on a coworker's desk or in a conference room.
Change the coffee in the office coffee maker to decaf.
Put a "Please Use Other Door" sign on the entrance to your office building if it only has one entrance.
Pull on a coworker is to press ctrl+print screen on their workstation, then paste it into Paint, save the pic, and set it as the desktop background. Move all of their icons to the trash. When they get back to their desk, clicking won't accomplish anything!
Q: What do actuaries do to liven up their office party? A: Invite an accountant.
Fill someone's hair-dryer with baby powder.
Q: What do you call a financial controller who always works through lunch, takes two days holiday every two years, is in the office every weekend, and leaves every night after 10 p.m.? A: Lazy.
Reaching the end of a job interview, the Human Resources Officer asked a young Engineer fresh out of MIT, "And what starting salary were you looking for?" The Engineer replies, "In the region of $125,000 a year, depending on the benefits package." The interviewer enquires, "Well, what would you say to a package of 5-weeks vacation, 14 paid holidays, full medical and dental, company matching retirement fund to 50% of salary, and a company car leased every 2 years say, a red Corvette?" The Engineer sits up straight and says, "Wow! Are you kidding?" And the interviewer replies, "Yeah, but you started it."
Q: Why did the can crusher quit his job? A: Because it was soda pressing.
Put tape over the optical sensor of someone's mouse.
Hide all of the desktop icons on someone's computer and replace the monitor's wallpaper with a screen-shot of their desktop.