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use the keyboard shortcut

Command + N to quickly open hundreds of finder windows

then watch as he manually closes them all by clicking the red X

simply click the grey oval shaped button on the top right of a finder window... it could be funny watching him panic cause his toolbar is missing.

thats all i can think of at the moment
 
Thanks for all the suggestions, I might try them all at once and see how he reacts!

I have just thought about trying to open all of his applications (cmd+a, cmd+down), for a macbook it should take ages to recover...

it wouldnt be too bad if he was smart enough to press cmd + option+ esc, to get his force quit window.

Then again... even experiences mac users dont know about that feature in OS X... soo i doubt he will.

lol,
 
Open system preferences, go to CDs and DVDs and change the Actions...

Also fun to set them to run a script that ejects the CD and opens an alert window which whines about the inserted disk's content.
 
haha don't worry, I wasn't intending to 'break' his computer and certainly not risk losing any files. I am quite certain that as long as it does nothing permanent there will be no problems, besides, It's a two way thing...

yea just dont get carried away. dont rename the home folder, that would be kinda bad lol


you could go to system prefs and change the audio output setting lol
 
I've got a great one. Go into the Utilities folder (Applications-Utilities), open Keychain Access, choose "Keychain Access- Preferences. In the General tab choose "Show Status in Menu Bar". You will see a lock appear. Click the lock and choose "Lock Screen". The screensaver will appear, any toggle on the mouse will turn off the screensaver and the login screen will appear requiring his password.

Half the time people don't remember their password. :D
 
I am not really a prank person with other people's computers, but the iAlert one is hilarious. If you know that person's password, you can start sharing his screen in yours and start moving the cursor when he is using it too.
 
While it's quiet, use Google to goto a very dodgy porn site, and when he comes back it's set to appear upon opening the MacBook, just be sure to have the girl he has a crush on about :)

I don't take any liability for his retaliation for this:apple:
 
press shift make sure can't see it kinda idk how you would do that and then have him minimize a window. lol:D:D:D
any action would go in slow motion, like the expose button, minimize, dashboard open/close, ect

also control and two fingers on trackpad and zoom in on a point on screen
 
get a apple remote, and put him in front row while he is using his computer. Or, even more fun, download and install iAlertU
 
1. right click on any icon in the dock and then invoke multiple Exposé, Spaces and Dashboard keyboard shortcuts. then when you close the right click menu they all activate.

2. take a screenshot with apps open and then set it as the desktop background with no windows on the screen. :p

protip: hide the dock, move all files and folders on the desktop to another folder and hide the hard drives in Finder's preferences, if using Leopard set the menu bar to opaque and remove any animated menu bar icons, so pretty much anything that will give it away at first glance.

3. open Terminal and run "yes > /dev/null & yes > /dev/null". this is an infinite loop and uses 100% of the CPU's core (why its needed to be run twice) and then close the Terminal window and switch apps. your buddy will wonder why his fans are on full blast! to quit the two Yes processes press "control-C" while in Terminal and then type "killall Yes".
 
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