A friend in high-school used to do the old trick of copying a DLL onto a floppy disk, renaming it "essay.doc", and handing it in to the teacher. Next week he'd feign concern that the disk must have got corrupted somehow, but by then he'd bought himself an extra week to write the paper.
I had a QuickBASIC program that'd spit out a generic disk error screen, and later a Visual BASIC program that'd put up a Windows dialog saying that it needed to be open on NT 4 or later (school system was Win9x at the time). Good to hear we all slacked off the same :P
It was a different time...