My daughter says the damaged floppy trick always worked for her.
Then she could blame it on the school's computer eating her floppy on Friday, with the teacher as a witness, and buy herself till Monday to actually do the report and bring it in on a good floppy. (only works once per teacher)
Actually, i did that on a test!
It wasn't intended, i removed the floppy while it was still writing. Truth is that the test didn't go that well, i was expecting something like a 12 out of 20. I redid the test on the next day (a different test, of course), and i got 19 out of 20
(this happened on high school, not on university, of course)