What is the hardest boss in Video Game History?

[Yosher]

There is actually a easy trick beat him, I haven't actually done it, but https://www.youtube.com/watch?v=7iX4qtTbN2o

wow lol, i never knew. might try to do this just for fun (and the achievement of course)

[Ad Bot]

[Space1255]

Ok I'm going against the final boss in FE:Awakening on Hard mode and I'm worrying about Lunatic mode. :(
In my personal history it's gotta be in the top 20.

[Blue Screen]

imo the Necromancer in Castle Crashers was pretty damn hard if you don't have the right stuff on you
because of all thoSE loving BEEFED UP ENEMIES AND HORDE OF ENEMIES
(had to spend some time leveling myself up before i could kick his ass, and i did)

[Chillah]

All Mario bosses because they're so incredibly hard