Afghanistan veteran Sam Arnold uploaded this spine-chilling video of a US Marine getting a direct headshot from a Taliban sniper—only to be saved by his kevlar helmet. It's incredible to watch, especially the face of relief and disbelief of the impact victim. That was a really close call.
According to Arnold, "the Marines were conducting a joint helicopter raid in the Now Zad district, Helmand Province in 2013. The shot occurs right at the :45 mark in the video."
Update: As some commenters point out, the guy was extremely lucky. The bullet passes "through the gap between the kevlar and the suspension," which means it was coming at a very shallow angle. Had it be a more perpendicular shot, the bullet may have gone through the helmet and blown his brains off.