Batman and Joker have been arch enemies of each other for decades. This is one rare video of Batman laughing with The Joker. Take a look:
Batman Laughs With Joker:
Although, Batman laughing here seems more creepier than The Clowned Prince of Gotham himself. This is perhaps one of the most rarest moments in comic history where we witness Batman laughing.
May be only The Joker can make Batman laugh. It is a bit twisted in itself because deep down both Batman and The Joker are broken emotionally. The Joker’s reasons are unknown but we all know why Batman is so shattered inside and perhaps only The Joker is truly able to reach him.