Whilst playing "Tom's Tech Support" one evening, I had a friend who had no computer savvy at all completely believing that defragging a hard drive involved completely taking the drive apart and supergluing all the pieces inside into one cohesive whole, so they couldn't move at all. Over the phone, I had him take his computer apart, pull the HD and he had an allen wrench poised to pull the cover on it, before I gave in and stopped him