Ross Lynch is eerily good as Dahmer, like a very young Philip Seymour Hoffman – stolidly silent, heavy-footed, incubating his resentments. School becomes a theatre of cruelty … My Friend Dahmer. They kept him around as their mascot and cartoon muse, laughing sort-of with him and sort-of at him. This film shows how Derf (Alex Wolff) and his cool-outsider nerd friends cruelly took up the unhappy and lonely weirdo Dahmer (Ross Lynch), entranced by his loser glasses, short-sleeved shirts and intensively laundered blue jeans. My Friend Dahmer is based on the 2012 autobiographical graphic novel by cartoonist John “Derf” Backderf, all about his true-life, high-school acquaintance with Dahmer, who was later to become one of the nation’s most notorious serial murderers. But this brings Dahmer closer to America’s current zeitgeist than is comfortable: our world of Donald Trump impersonating the disabled New York Times reporter Serge Kovaleski. In real life, Dahmer only got to watch Mondale working and didn’t actually speak to him. What sort of a creep mocks people with a physical disability do you imagine? And what sort of a community rewards such a creep with anti-establishment hero status? The film shows the teenage Dahmer going on a school trip to Washington DC, entering the White House and meeting the vice-president, Walter Mondale.

It’s about the teenage years of Jeffrey Dahmer in the 1970s and especially his high-school penchant for pretending to have epileptic fits – to the hilarity of his nasty and fickle friends. The Childhood of a Serial Killer could be an alternative title for this queasily gripping movie from writer-director Marc Meyers.

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