You may have never heard of this guy, but he became one of Batman's moat famous foes. Red Hood was a mysterious criminal (possibly a former chemical engineer and then struggling comedian that could have been Jack) that donned a red dome helmet (that haf 1-way see-through glass), a red cape and a tuxedo. He tried to rob a chemical plant, but a certain cape crusader (Batman) got in his way. Left with no alternatives, he jumped into a vat of chemicals and swam away (his helmet had an emergency oxygen supply). In The Man Behind the Red Hood story, it was revealed that the chemicals turned his hair green, hid lips "rouge-red" and his skin "chalk-white". So he decided to become the clown-theme villain the Joker. He became Batman's arch-foe, while doing bizarre crimes like dressing up like famous comedic characters and rob people or using an utility belt (similar to Batman's) with a various clown-themes weapons (such as a hand buzzer and fake cigarettes that explode) and a small cork.
The Greatest Joker Stories Ever Told