[Unknown Target]

The first part of the second one I didn't recognize, but the second half was when he picks up the super star (that gets him going really fast and you can touch enemies and they die right away).

By the way, what was the dunna dunna dunna, with the guy sneaking up on the other guy with the mic?

[Flipside]

Bowzers Castle With the Ghosts.

[Taristin]

I thought the 'dunna dunna dunna' was the dungeon levels in SMB. But I didn't get the guy behind the guy on the mic, either.

EDIT: And flip answers before I finish typing.

[Mongoose]

The "dunna dunna dunna" was actually any of the underground Super Mario Bros. levels, like level 1-2.  It's amazing how such a short theme with so few notes can be so addictive and just plain good. I recognized a few of the tracks from Super Smash Bros. Melee; I believe that some of them were from Yoshi and Kirby games, neither of which I've ever played.  The Link part and the Mortal Kombat scene were both hilarious.

[Corsair]

That really was excellent... those guys did a great job with it. Not that I'd ever want to do that with my a cappella group...