Hanging out with Batman can be hazardous to your health. Nobody knows that better than the second Robin, Jason Todd. The streetwise Todd was the victim of one of the most disgusting publicity stunts ever, where DC Comics let the fans vote on whether the Joker should beat him to death with a crowbar or not. Because comics fans are horrible, they voted "yes," and Todd was mushed into a paste by the Clown Prince of Crime, sending Batman into a tailspin that could only be resolved by finding another teenage boy to put in short pants.
But Todd came back! How? Superboy punched the fabric of reality. You heard me. Trapped in an alternate dimension, a parallel version of young Clark Kent was hitting air so hard it caused probabilistic shockwaves in the main DC universe, bringing Todd back to life and making him adopt the villainous identity of the Red Hood. Comics, everybody!