Have any of you experienced unruly pengers on planes?

It is appalling, the behavior that people display, especially on planes. With all that has happened in the air with terrorist acts, I don't blame the airlines one bit for demanding pengers follow all rules. Am I missing something here, that some people feel they have the 'right' to misbehave like immature children on planes? I don't travel by plane anymore, but wondered what if anything you may have seen or experienced on planes. I would not want to be a flight attendant today.