95% of all boxing fans. because they equate anyone who has ever been staggered let alone knocked down as having a glass jaw. and if they lose 1 time they are a bum. so that accounts for pretty much everyone who posts on this boards mentality
but to answer the thread , the biggest glass jaw ever when it comes to an actual world class fighter and should be a poster boy for it is oleg mascaev. he lost 7 times and all by knockout and if anyone has never seen his ko loss in the amateurs to the cuban, he probably didnt wake up for a week.. (that makes 8 ko losses)