Be honest. When you were five, you did it. And loved it.
See also Pranks.
So the computer will tell you that your password is incorrect. See also Computers.
Psst. Got something funnier? Add your own funny thing to do.
Waving to your friend who is behind someone waving to someone behind you.
This works best in cities. Everyone follows behind as you lead your army to victory!
You know, for entertainment.