I was wondering has there ever been a moment where the joker is ever serious?
Well Joker was written more evil than funny in his oldest appearances. In the Joker graphic novel http://www.comicvine.com/joker-joker/37-141427/. When Joker had his transformation in The Clown at Midnight http://www.comicvine.com/batman-the-clown-at-midnight/37-106607/ and in RIP he was also pretty intense. Same as Dark Knight returns. The Killing Joke as well.
Pushback/Payback, when he, in an oh-so out of character way, missed his wife & wanted revenge for her death. Not only was it OOC, but it was unresolved. Hardly forgivable. I wanted to see Joker & Hush duke it out.
He's had plenty of serious one-on-ones with Batman & he seems serious when fighting hand-to-hand with anyone who isn't Batman. If you can make him angry & unammused, he's plenty serious...just not often.
There was the time he killed Sarah Essen-Gordon (James Gordon's second wife). Joker had kidnapped all of these infants and Sarah had to choose between herself or the children. She saved a baby Joker dropped and at that moment of opportunity, Joker shot her, leaving her surrounded by the babies and Joker walked away with a frown.
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