Heath Ledger’s fans are getting together to demand that his Oscar-nominated portrayal of the Joker be the last for the famous character.

“We think Heath deserves this honour,” TheUltimateJoker.com spokesperson Fer Barbella told CNN from Buenos Aires. “After we saw The Dark Knight, we thought this Joker was really the best. It deserves to be withdrawn from any Batman sequels.” The Web site’s online petition already has more than 18,000 supporters.