The Movie: The Ruins (2008)
The Character: Eric (Shawn Ashmore)
Never mind the fact that all the characters are fairly stupid for A) agreeing to go explore in a dangerous part of the jungle where some random stranger's brother has vanished and B) visit a temple several people have told them is banned.
No, the craziness continues even when the gang discover that the relic is infested with blood-sucking intelligent flora.
Though he's trying to save his girlfriend, Eric forgets the important lesson that reads Never Mess With a Psycho Girl Infected With Killer Vines.
If Only They'd: Left well alone and let Stacy keep hacking away at herself. Plus told the rest of the gang: "you know what? Screw the spooky old temple! Let's go to the beach."
How Do They Die? Stacy stabs him right through his bulls-eye T-shirt. Irony alert!