There was one mission with MGS1 Snake where you fight four successive battles in a row, if you die, you restart. First battle is one soldier (easy), second battle is a squad of 9 soldiers, some of whom are cloaked (I could pass it every time, but usually took a lot of damage and there's only one ration available), a third battle with 21 soldiers including 9 Arsenal Tengus (they fucked me up on the regular, there's a stunlock you can get on the Tengus with the coolant but you get grenaded and shot at by the other soldiers), and then a fourth battle with a giant monster soldier where you need to hid behind a box and shoot a fast-ass UFO out of the sky with a stinger missile before the giant slaps the shit out of you. Usually I was so weak if I got to this point that one slap and I was dead.
I had one of my more badass runs where I made it through the third stage with about a quarter of my health but I had managed to save my entire ration, so I could take a hit from the giant, recover, and probably take two more hits, giving me lots of leeway to hit that UFO.
Confident that this would be the time after the other 10-15 weren't, I dodged the first slaps, whipped out my stinger, fired it, accidentally nicked the box I was hiding behind, and killed myself in the explosion because I forgot to equip the ration. I don't throw controllers but that's about as close as I get