Happy was a member of a bank-robbing crew that was hired by the Joker to steal from Gotham National Bank. Happy and Dopey gained access to the bank's roof with a cable gun, where Dopey disabled the silent alarm. Happy, who had been ordered to do so by the Joker, then shot Happy so there would be one less share in the earnings from the job. He then entered the bank building and began breaking into the large safe, which was wired up with electricity. Chuckles, another member of the crew, explained that it was a mob bank they were stealing from. Happy then gained access to the vault, and Chuckles told him that the Joker had also told him to kill a fellow member of their team, before shooting Happy.

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