Why It Sucks When Other People Do It: Ho. Ly. Crap. That boss fight took 3 and a half days. You used up all your healing potions, you're out of mana, and half your life bar is gone. But you did it! The Ultimate Evil is slain, and you have saved the world. Now just exit the room ooh, there's gonna be a cutscene. Settle in and watch, you've earned it.
You have got to be kidding. He's not dead. What's worse, it looks like he was just screwing with you before. Because now he's getting up, he's twice his previous size, and he is far more spiky and shadowy and scary than before. And you have half a life bar, no items, and only the faintest glimmer of hope. Oh, never mind, you're dead. Goodbye, glimmer. We barely knew ye.
Why YOU Have To Do It: Of course you have to use continues. Have you ever played all the way through a platformer on any mode besides Easy and never died once?
Didn't think so.