Gambol was also displeased with the fact that the Joker stole money from the mob's bank, with his anger rising when the latter implied that he used the stolen money to create his "cheap" suit.

What did the Joker do to Gambol?

The Joker revealed himself alive and immediately put a knife in Gambol's mouth. The Joker proceeded to tell one of the many stories he had about how he got his scars, and as he was about to scar Gambol like his father supposedly did with him, he turned to one of the guards to ask “why so serious?”.

Why is Joker a favorite villain?

With the unique inhuman ability and powerful mind set, The Joker is undoubtely the best super villain of all times that can't be compared with any other super villains. He's incredible superhuman power made him the most popular and the most admired supervillain in the history of DC comics as well as for the Batman.