call a halt to the “Barbenheimer” hashtag that has helped make the film a global blockbusters.“Barbie”, which stars Margot Robbie in the title role, has grossed more than $800 million in worldwide box office, while the film about nuclear scientist J. Robert Oppenheimer that opened around the same time last month has taken in more than $400 million.Warner Bros initially latched on to fan-produced memes that depicted Robbie’s Barbie with actor Cillian Murphy’s Oppenheimer alongside images of nuclear blasts.But fans were not amused in Japan, which in coming days will mark the memorials of the atomic bombings of Hiroshima and Nagasaki 78 years ago.“If one were to create an illustration or derivative art of Barbenheimer, it should not be of Barbie delighting in a mushroom cloud,” said Koji Maruyama on the Change.org website.