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.

A lawyer has just settled down in his new office. So now, he is thinking what he can do to have clients. After a long time thinking, a man comes into the office. Right away, the lawyer decides to make his new plan take action. So he picks up the phone and says: "Unfortunately, Ms. Onassis, I cannot undertake your case right now. I am working full time, call me in a month to see if I can help you." He puts the phone down and says to the waiting man: "How can I help you sir?" "Nothing really, I am from telephone communications, I just came to connect your phone."

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.

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?"