TURN THEIR MAC INTO AN ASYLUM

Annoyance Factor 7: Imagine how annoying it would be if everything your friend (co-worker, evil nemesis, etc.) did was spoken aloud by a person who's clearly one sleeve short of a straightjacket? Now make it happen: Go under the System Preferences in the Apple menu and choose Universal Access. First, at the top of the panel in the VoiceOver section, click the On button. Next, click on the button named Open VoiceOver Utility. When this separate dialog opens, click on the Voices tab, and from the Default Voice pop-up menu, change the default from Fred to Deranged. Want to make it a little eerier? Lower the Pitch to around 20. Then close this window, close the System Preferences, and call Nurse Ratched, because it's time to pass out the "happy pills." If they've been using the Mac for a while, they may go straight to the Speech preferences to see if Speakable Items is turned on, but it won't be. By the way, if they're working late and you want to freak them out, lower the lights, then do this same trick, but instead of Deranged, try Whisper and set the master volume to 100%. If you try this one, better keep a mop nearby.