I went to an Evanescence concert a few weeks ago. There was PLENTY of room where I was standing, but this group of girls kept bumping into me. I'd back up, they'd back up, and Suzy McSnooty would continue to bump into me.

After about 3 or 4 circles of me backing up and them backing up, I elbowed the girl hard in the back.

And of course I was So Very Sorry! I wasn't aware she was standing RIGHT THERE!

They got the message.