Speaking as someone who has been to, performed at, and promoted thousands of concerts, there is nothing that really irks my cookies more than people who "shoulder ride."  You know, those who put their girlfriends up on their shoulders, thus blocking  everyone's view of the stage. Every now and then, one of these shoulder rides go wrong.

Okay, so this next one doesn't go wrong. We just included it for the obvious reason.

Avoid injury, and pay a little common courtesy to the ticket buyer behind you, and avoid shoulder riding at concerts.