When I was young one of the most popularly quoted lines among my peers was “Hell is other people” from Sarte’s No Exit. In college it was posted on the door of every dorm room, or at least every third dorm room, or maybe it was just a few on every floor and it just seemed like it was everywhere.
The problem is it was almost always misquoted, or rather misunderstood. Sure, Sarte wrote in French, and the play was originally called Huis Clos, so, yeah, anyone who said “Hell is other people” was, strictly speaking, quoting a translation of the original, but the important thing is that Sarte was one of the major figures of the Existentialist movement, and even though one of his characters says, “Hell is other people,” or something like it, the author of Being And Nothingness believed that it is our perceptions that shape the world. If Sarte knew how many kids were going around saying “Hell is other people” it would probably make him say, “Merde.”