Without a doubt the most famous villain of the DC Comic Book Universe, and arguably the most interesting and most well-known villain of all time, Joker has been around since the first issue of Batman hit the stands. For 76 years (well, almost), he has accompanied the Dark Knight like a shadow, effectively making him what he is today: the hero who has to deal with the most dangerous specimen to come out of a writer's mind.

That has to say something, given the fact that the Joker possesses no superpowers (most of the time, of course).

It’s understandable that some people might have forgotten some small – but very interesting – details from this character's history. And it’s understandable, because his past has been kept pretty vague thus far, even if some origin stories exist. Most recently, Christopher Nolan decided to keep the Joker's past hidden "“ and this made Heath Ledger's Clown Prince of Crime even more terrifying.

So, what if we dig a little deeper in the 70-something-year history of the character? What will we find in there? That’s what this list is all about: The ten most interesting details from the Joker's past (we can bet we'll find some skeletons buried in here, somewhere).