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.
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.
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!
Paint a bar of soap completely with clear nail polish so it won't suds up.
Hide an alarm clock in someone's bedroom and set it for 3:00 a.m.
I just recently discovered that there is a national holiday named after Atheism. April FOOLS day. Like this story in the name of Jesus.
Two programmers after work, talking in a pub: "You will never believe me when I tell you what happened to me yesterday. I met a very nice blonde in a bar." - And what did you do ? "I invited her to my place, we had some drinks and then the girl asked me to undress her." "Are you kidding me ? And what did you do then?" "I got her blouse and her dress off and then i got her to sit on my office, right next to my new laptop." "Oh, you got a new laptop. What model and what are its specifications?"
Take a squirt gun into the rest room stall next to someone and shoot little drops over the wall every couple of seconds while pretending to pee.
Office executive "Sir, can I have a day off next week to visit my mother-in-law?" Boss "Certainly not!" Office executive "Thank you so much sir! I knew you would be understanding."
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."