Wasn't there a riot at the premiere of the Rite of Spring?
There absolutely was. The Rite of Spring premiered as a ballet, and the dance routine that went along with it was very disturbing and primal (for 1913). People were going batshit crazy over it almost immediately, people were booing, some were cat-calling, some were arguing right in the audience over whether or not this was "art," and there were even a few fistfights. The choreographer, Vaslav Nijinsky, had to scream out measure numbers from the side of the stage so the dancers knew where they were in the piece. It's said that he was standing on a chair, and leaning so far out towards the stage that Stravinsky himself had to hold on to his coat-tails to keep him from falling over. The dancers couldn't hear the music over the audience freaking out! So, it was actually more the choreography than the music that caused the riot. It premiered in France, and ballet was huge in France, and people were pissed about what Nijinsky did.
Go to 3:00.
(It's primal, ritual dance, if you didn't know. Something about fertility, if I remember correctly.)
This was essentially the birthplace of angular ballet.
However, while it was mostly about the choreography, the music also played a part in the riot. The harsh, dissonant tonalities were definitely a new thing, and many people weren't ready to accept it. Another famous fact is the bassoon in the very beginning, which is played well above where a bassoon is supposed to be played. Apparently, this really pissed some people off, some thought Stravinsky was making a mockery out of the orchestra, though that wasn't his intention at all.
edit: Sorry for all the edits. It's been a while since I studied this piece, some of my info was off. It should be more accurate, now.
Also, not to start a fight with Holk, some of the composers I mentioned above are past the point of "classical" music. Just mentioning that, so you don't get turned off to them just because you might think they're all from the 1700's (which they certainly are not).