Originally Posted by
shelbyfv
I know a guy who terminally sawed the bb shell of a Cervelo via repeated chain drops. Seems beyond oblivious but it happened.
I'm guessing something other than (or in addition to) "chain drop" was involved here. Once the chain is dropped from the ring, it's no longer connected to the drivetrain and no longer being driven forward, so it can't really "saw" into the frame unless the bike is moving backwards.
A dropped chain can definitely scratch the BB shell and damage the paint, but "terminally sawed"? I'm not too sure about that.