I actually had a teacher once who said; 'There are no stupid questions, just stupid people who ask questions. Once you answer their question, they are no longer stupid.' At least in regards to that particular question, even if it leads to more questions. Then again, some people remain stupid even after the question has been answered. /bcforum/images/%%GRAEMLIN_URL%%/wink.gif
When people talked in class, interrupting him, he would stare at them until they stopped. When they would notice and say "I'm Sorry", he would say "Don't be sorry, be QUIET!" If you went on too long without noticing that the rest of the class and the teacher were staring at them, he would toss a chalkboard eraser your way.