The line comes from The Room, the 2003 independent drama written, directed by and starring Tommy Wiseau. His character Johnny says it to Mark during a rooftop conversation after hearing a strange anecdote, responding with laughter that feels completely mismatched to the tale. As The Room became a cult favourite through midnight screenings and clips shared online, the moment was isolated as a shorthand reaction. It remains popular because viewers instantly recognise the awkward delivery and understand it as polite, sarcastic disbelief.