Ceremony's early stuff before ronhert park was pissed as hell. pretty heavy too IMO.

anything by Billie Jo Spears

Thought hard on this and i think Korn's my gift you was the most angy just messed up song i have heard!

Disturbed - Asylum

Its even more dangerous if played with the video.

Hmm..... If we're looking for angriest? At the moment, I'd say People = **** by Slipknot. I go through phases, though; the song ****in' Hostile made me want to kill people a lot a couple days ago :D another Slipknot one that makes me want to punch something recently is Metabolic XD I'm probably being lame, but hey, I'm only thirteen xD

Are there any bands heavier than Black Sabbath, angry or otherwise (who can also play their instruments)?

These guys seem pretty pissed off:

There's more, but this is for starters, although I will agree that Tunnel Canary are seriously up there in my top 3 for Noise/Harsh Listening (and that's a good thing) after checking it out.

Seriously in my Top 10 of this kind of thread. Henry Rollins era Black Flag is great on the studio albums, but best experienced live.

Shut the **** Up by Fornicator.... youtube it if you dare.