Install the Blue Screen of Death screen-saver on someone's computer.

 763

3  

Remove the shower head and place a chicken bouillon cube in it, then put the head back on.

 643

1  

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

 745

0  

Change the coffee in the office coffee maker to decaf.

 1345

1  

Find a sleeping person, fill their hand with shaving cream and then tickle their nose.

 746

0