like, stopping you in the mid of performance, saying show me your hands before you continue, or... screaming give me that bottle now, your hinding in that angle, let me stand there... etc...
what do you do? kick them and say get lost?
you shouldnt kick a person who wants to see what your doing up close, but all of us should kick you lol. this topics been covered toooooo many times, try the search engine, type in 'hecklers' or something along the same lines.