Crocomire

The Crocomire is a miniboss in Super Metroid. It is found in the area Norfair on the way to finding the Grapple Beam. The Crocomire cannot be killed by conventional means. Samus's weapons (such as Missiles, Super Missiles and the Charge Beam) only succeed in making the beast take a step or two backwards. Thus it is sort of a shoving match between Samus and Crocomire. The beast shoots fireballs from its mouth (that she can then destroy for health and missiles) and will try to rake her with its claws. Behind Samus lay a wall of spikes. Behind the Crocomire lay a pit of lava (and an Energy Tank after utilizing either the Speed Booster or the Grapple Beam acquired later.).

After managing to make the Crocomire fall in the lava and witnessing its gruesome death (its skin melts right off), the fight is seemingly over. Yet...there is still a gray door from whence Samus came and the creepy before-boss-fight music is still playing. When she reaches the wall of spikes the Crocomire's skeleton rips through the wall...

...And then falls apart. Samus would then breathe a sigh of relief, take the health and missile pickups and then curse the game designers for scaring her like that. Then continue on her not so merry way.