6. Yinsen Takes One For The Team (Iron Man)
Yinsen is the scientist who helps Tony Stark build the clunkybut close enough for government workMark I Iron Man armor so they can both escape captivity. Yinsen himself does something incredibly stupid that I'll get to in a minute, but Tony Stark does as well that leads to Yinsen's deathmainly, why the hell didn't he upload the operating system into the armor sooner? Why did he feel the need to wait until he was strapped in the armor when he actually needed someone else's help to do it? What if Yinsen had been killed or removed from the cave before then? That aside, Yinsen gets his hands on a rifle while the software is uploading...and instead of taking cover on the side of the door and conservatively shooting covering fire at any approaching soldiers, decides to run down the cave, firing blindly in an effort to presumably scare away the plethora of men with rifles approaching.
Yeah. Needless to say, this is not a good strategy and sends Yinsen to see his family in the next world. I suppose the argument could be made that Yinsen was committing suicide by terrorist in order to do just that. Still, a little forethought by Stark might have allowed Yinsen to live.