There's nothing wrong with characters in movies doing dumb things. Mistakes can be fun to watch, and anyway, real people make mistakes all the time. But Hollywood has an awful habit of having characters do something incredibly dumb and then everyone else acting like this was a wise and noble act, something we should all hope to one day do, if we're only brave enough.
We're talking about heroic sacrifices, which can make for a dramatic and satisfying end to a character's story, unless they're so stupid that we get up and shout, "You idiot! You didn't have to do that at all!" We've touched on this subject a few times before, and now, here are even more heroic sacrifices that are super dumb when you think about them.