The distressing scenario in a video game when you're caught in an inescapable Death Trap and have to watch your Life Meter gradually be reduced to nothing — or, if you're a One Hitpoint Wonder, exhaust your supply of One Ups one by one as you keep respawning in a very unfortunate position.
This is basically what Mercy Invincibility is supposed to prevent. It can even be utilized as a cheap method [...] [tvtropes.org]