The chestburster scene from Alien Romulus makes me angry because they did everything right and still died
Spoilers for Alien Romulus: There's a chestburster in it.
Okay now that we're over that minefield let's talk about it. Putting aside the necessary stupidity that has to happen in an Alien movie for the plot to occur, I thought the group was actually being very sensible. They went onboard the Renaissance to retrieve cryo equipment and they were working fast because they sensed that it was scary as hell on their for some damn reason. Navarro gets facehugged but unlike every other character in the series, they dealt with it very promptly by freezing the creature and removing it. A few minutes later it turns out she was infected anyway and an Alien pops out of her. Bullshit.
Xenomorph biology has always been nonsensical but this takes the cake, the CB wasn't on Navarro's face for more than 5-minutes in-universe but it still had more than enough time to deposit the embryo and feed it enough nutrients that it wouldn't die immediately? In the first movie, Kane was out for a day, and every subsequent film had it take at least a few hours before the infectee naturally woke up and had their ribcage exploded.
I had at least hoped that this would mean the Alien that came from her would be easy to deal with, but no. Just as impervious as the rest of their kind. It's just unfair really, I really thought it was contrived like Kay's death at the end. But this is an Alien movie, they've been contrived for years. Really hampered my enjoyment of an otherwise decent film.