I honestly am not sure if I had already seen this film or it was just so formulaic I already knew everything that was going to happen. Each is as likely
Do not bring popcorn into this movie, there is no point because you will no be able to unclench your jaw or fists for 90 mins.
Honestly. When I was on trial for murder (SPOILER: I didn't do it) and the jury were deliberating, it wasn't even as tense as this movie.
Before I saw Gravity, I had fingernails. Not anymore.
Totally worth it.