You bastard! The beginning sound is exactly like my apartment buzzer and I jumped up and ran down the hallway thinking a package was being delivered. Even though I knew this was the case (and had already written the last sentence) it got me again when the track looped.

Nice sound design. This certainly would work great as title music! I can imagine a terse quick cut montage over this. I think you could beef up the percussion a bit. Those handclaps are begging to be more of a smack. I'd consider adding a little (and I do mean little) overdrive distortion and compressing them a bit to give them a fatter squash. You could also (FUCK, there's that ringing again!) you could also try doubling the claps with the same sample or a snare or something flanging them by a couple milliseconds to give it more presence.

All that said, this is really good as is. Moody and effective. I'm also kidding about the ringing sound so don't be offended. It's just uncanny. Oddly enough, though nobody rang my buzzer, my package actually WAS downstairs waiting for me. Crazy.