Strangers are carrying on and you wonder if maybe this is all a dream, until the obnoxious guests put too much weight on a sink, despite warnings. This flood (!) sends them all away. After a reset, Lawrence announces she is pregnant, and with that Bardem releases a new poem. The house is now swept up in visiting fans and paparazzi that soon devolves into chaos. And a retelling of the entirety of recorded human history (mostly war) in about two, very chaotic minutes. Again, all inside the house.
What's so cool is that you can, if you want to, read this movie on many levels, including a literal, supernatural one. It still works as a horror film about a woman going bonkers, and it also has its key gross-out scene. (There were some walkouts, but if Communion is consuming the Body of Christ, what do you expect that to look like?)