In the Arkham Knight universe, Harley Quinn’s gang dresses up in Joker’s likeness as a way of "honoring" his memory after his death.
The phrase also appears in specific artistic and niche contexts: Jokers Memory
In the Arkham game series, Joker’s "memories" become a literal infection in Batman’s mind due to a blood transfusion and fear toxin, forcing Bruce Wayne to relive the villain's distorted perspective. "Joker's Memory" in Pop Culture In the Arkham Knight universe, Harley Quinn’s gang
A Joker's Memory is a rare, obscure psychedelic album recorded in the mid-1970s by a band called Joker's Memory. In the Arkham Knight universe