The Joker isn't laughing anymore. He's pissed off at his own movie. 'Suicide Squad' opened today, and IGN asked Jared Leto to fill in the blanks about the Joker's story, when it comes to scenes that didn't quite make sense in the movie.
Actual quote from Justice League: War (from the DC Animated Universe). Fantastic movie, and the banter between Green Lantern and Batman is great! (also the animation is closer to that of the New 52 style).