How do you pull good pranks using Mac OSX?

Question

Also, I've been trying to connect remotely to another computer using Terminal. It worked once, but now it tells me that the password is wrong. Is there a different password for the computer and SSH access? Is there another way to do this?

Answer 1

Take a screenshot, then display it as a full-screen image (slideshow). The person that gets on the Mac will think the computer is frozen.

Write a script using AppleScript that will activate Expose over and over again.