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I took my mic to the office's bathroom down the hall and put the mic in the toilet bowl... FLUSH!
I went back to my office and cropped the recording down to size. Then, I put it on a floppy and walked over to my buddy's workstation (he was gone). I put the file on his HD and set windows to play that sound every time he did something :)
I went to my buddy's workstation (same one), and took a screen shot of his desktop. I opened Paint and saved it as a BMP.
Then, I set the desktop wallpaper to be that BMP.
Then, I selected all his icons and moved them off the screen and got rid of the Start bar.
It took him and the tech guy over an hour to figure out why none of his icons worked.
There was a good one that mimiced the C drive being wiped, watch em panic.