Enter the Joker
The Red Hood gang- a low level street criminals recruits a failed comedian into their ranks. Their first big job is to rob the Ace Chemical plant. With Gothams underworld in a frenzy with rumours of 'The Batman" - a monstrous beast out to decimate crime, the gang decides to make their new Comedian the scapegoat in case they run into trouble - and putting him in the ridiculous costume.
The break in goes smoothly at first, but the the "Bat' appears and quickly subdues the gang. "the Red Hood" panics and attempts to remove his helmet to plead his case to The Batman. Stepping on his cape, he slips. and falls over into the vat of Toxic Chemicals.
"Aaugh. I'm Stinging, Itching... My FACE! My Hands! Something in the Water? Oh Jesus. it BURNS... Get this stupid hood off so I can ... ... see ...
Ha ha ha.
AHOO HOO HOO HOO HOO
Enter The Joker.
[Paraphrased Joker Origin Story from the Comics (The Killing Joke]