Put a "Please Use Other Door" sign on the entrance to your office building if it only has one entrance.

 1593

1  

Paint a bar of soap completely with clear nail polish so it won't suds up.

 827

1  

Change the coffee in the office coffee maker to decaf.

 1569

1  

Hide an alarm clock in someone's bedroom and set it for 3:00 a.m.

 864

0  

Put tape over the optical sensor of someone's mouse.

 943

1