Midsommar’s stylistic antecedents are many and varied: Get Out, The Wicker Man, Cannibal Ferox (among others by Umberto Lenzi), anything by Michael Haneke (dumbed down quite a bit, of course), the cinema of Herschell Gordon Lewis, and, yes, National Lampoon’s European Vacation -- picture Chevy Chase’s Clark Griswold, in place of Dani or Christian, reacting to the unintentionally funny pronouncements of those silly villagers, then try to get that out of your mind.