This is one I do every year to as many people as I can.  I think it works on 
all windows PCs.

I wait till they are not looking and press the combination of 
CTRL+ALT+downarrow  It inverts their screen.  

Try to walk away as quickly as possible without drawing attention to yourself.  
A lot of people don't realize what happened and they can't coordinate working 
upside down to do a web search to see how to set it back to right-side up.

It helps if you know how to reset it back in case you can't get away fast 
enough.  

Brian

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