Thanks to Andrew playing Step Mania and downloading songs, I have been introduced to speedcore. This is precisely the kind of music I like to turn my brain off to. It's great to put on in the background while I'm working, or to listen to while working out.
The danger for me is in stepping up to terrorcore or higher: that many BPMs is awesome, but is going to get fatiguing if I listen to this repeatedly and for any great length of time.
Also, terrorcore (and some speedcore) is a little closer to death metal than I'd like a lot of the time. That is, despite being samples and remixes, it focuses a lot on topics I'd rather avoid, and it dodges too close to atonality to be any fun. Occasionally I get a good one -- completely random -- that samples from Family Guy, but more often it's stuff like "eat shit and die" and "listen you fuckers". Which, you know, ugh.
Where's my happy fun-times terrorcore?!
EDIT: lol. ask and ye shall receive. This one is remixing "It's a Small World" and voice clips from Anchorman.