I realize this is the humor forum, but I'd like to point out that this is a cast pan and they can shatter when they hit something, like a speedbump. Might it just be possible that a) yes some Iffy Lube person overtightened it, but also b) someone hit something, cracking the pan, thus leading to 3) it falling apart?
I like a good Iffy Lube bash as much as anyone else, but the threads should have stripped out before this level of carnage. Methinks something else is to blame here.