This is an old one I posted on another forum.
So, I was playing Mega Man 10.
I was trying to get the achievement where I beat the game without dying once. I'm at the 4th castle stage and decide to use my 1/2 damage item for the boss encounters, when suddenly I come across an energy tank in my path.
Now, this part of the stage is completely vertical, and I have to progress by climbing a long ladder to the top. The energy tank is in a crevice literally two blocks away from me, but to get to it I have to avoid fire-spewing obstacles and two of the enemies moving back and forth across the stage, so that I can drop down onto the tank.
Took me several dozen tries to get it down. Every time I got through one of the obstacles, I would hit something else, and typically this dropped me down to the previous screen below, where I would immediately get hit by one of the other enemies. This gradually degraded me from quietly calculating to yelling obscenities at the screen.
But eventually I actually got the E-tank!
I look at my life bar to see how badly my mishaps bruised me, and I have two pegs left.
I use the E-tank and continue to the end of the section unscathed, where there was a large health pellet waiting for me.