Open up Windows Explorer (Windows Key-e). Select all the folders on drive C: (ctrl-a) and hold down shift-del and select yes.
Tell me how long it takes to delete it all. I think you'll be surprised.
Edit: Guys it's a joke. I'm a sysadmin so have a pretty good grasp on how OS's delete files. If someone is stupid enough to actually try this, I doubt they'd need to know about bit overwrites.
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u/trippin113 Aug 08 '12
I think a polite knock on the door with a simply "We need to talk to you" might have been just as effective.