In Humpday, a pair of thirtysomething, fully heterosexual male friends decide to have sex on camera and submit the results to The Stranger’s amateur porn competition. From this ridiculous premise, writer-director Lynn Shelton spins a small miracle: a deep, hilarious, completely contemporary relationship comedy that explores with almost scientific precision how such a ridiculous premise would play out in real life. The results—executed by an ace cast led by the singularly appealing Mark Duplass—will have you alternately squirming and howling. by David Schmader