A discussion on Slashdot again reminded me of one of the most odd game copy protection things I've ever seen.
Ages ago, I got a game collection for Commodore 64 called 2 Hot 2 Handle, which had - I think - Shadow Warriors, Total Recall, Golden Axe and Ivan Ironman's Super Off Road. (Whoa, memory serves me well, if MobyGames is to be believed.)
Now, I think Shadow Warriors and IISOR worked fine, but Golden Axe and Total Recall had curious feature: the copy protection clankered the drive a lot, which could mean only one thing: A busted disk.
With a little help from my father, the thing was sent back, by mail, across the country, to the store it was bought from. Some time later, the thing came back with a note that said something like "The games are okay! If they don't work, turn the disk drive to its side." With a helpful diagram, too! (I think I'll scan it and put it here if I find it. =)
I think they just returned the exact same disks, because the game definitely did not work - but once I flipped the drive to horizontal position, yep, the thing worked just fine!
(As a side note, "Shadow Warriors" is not the same thing as Shadow Warriors, aka Ninja Gaiden. I bet a lot of people got disappointed. =)
Update, March 18, 2006: Yup, obviously, I could find the thing. Scan is above. Also of note that I was still confused about the whole Shadow Warriors thing: Both of the games were marketed as Shadow Warriors!...