If you have been speaking for a while, you have likely experienced someone in the audience who constantly interrupts, challenges your authority, or is just down right disrespectful when you are trying to speak. We call these lovely people "bullies" or "hecklers."
If you haven't yet experienced it, WONDERFUL! If you have and aren't yet clear on how to manage it, here's a great article in Entrepreneur.com that addresses it perfectly.
"Doing What I Love!