What happens in 4-1? That some kind of intentionally exploited glitch?

I really don't get the appeal of watching these when they're longer than 2 minutes.

When watching someone else play an old video game is the best use I can think of for twenty minutes, I'll just go ahead and kill myself.

With all due apologies, but I have to agree on these speed run videos. As anyone who grew up with a sibling and a console with just one controller can tell you, watching someone else playing a video game is as boring as televised poker championships.

I can't believe I managed to actually beat this fucker when I was a kid.

He's making the jump... it's his second time through and he hasn't even taken a hit yet!