It's a classic Batman comic story from the 1970's. Why Hennesy thinks this is obvious to everyone is beeyond me. If you're not into Batman comics, or even just older Batman comics, or even just the "mainstream" Batman comics, you wouldn't know.
They've re-published the comic I'm talking about in a few trades, and it was was adapted into an episode of </i>Batman: The Animated Series</i>, albeit combined with The Joker's Five-Way Revenge. Both great stories.
This sketch was made on the day that the Joker's creator, Jerry Robinson ( also the creator of Robin) passed away. The Fish is a reference to probably one of the most famous and sinister Jokers stories ever told, " THE LAUGHING FISH" wich was also adapted for the animated series. The plot revolves around the Joker poisoning Gotham city's water supply. I could be wrong on this but it also started the gimmick in wich the Joker " apparently" dies at the end of each major story, only to make an epic return later.
Very Creative. I love it. Love Joker's hair color a lot. different tones of green color, made it very detailed and more adorable. Love the fish idea and the colors in it are fantastic. The way you wrote "We'll never forget" is very interesting. Everything is perfect. Wonderful. HA HA HA...