Hehehe, We've all faced some of the most terrifying bosses in existance.

Let's take a look. Feel free to post some of your own as well.

The Guardian Legend: The Final Guardian

Oh boy, remember this gem. THe bosses just keep getting worst, and just when you think you beaten it. They throw this fucker at you. This guy is not a push over. He's actually been confirmed as the toughest boss in the game. The guy is equipped with missiles, eyes, and a pair of deadly claws. Bring erasers you're gonna need them.

https://www.youtube.com/watch?v=p7u-k2jGcu4

Touhou: Highly Reponsive To Prayers "Sariel"
Yes the original game has what is probably one of the toughest fights in the fucking series. Yup I mean this bitch.

https://www.youtube.com/watch?v=-YtSzXpjh60

Sinistar: Sinistar
No video for this guy... Cause I hate him, and screw the asshole >_<