As an add-on to what Ancient Observer has said about getting through a long meeting without saying anything, try this method that I was taught as resistance to interrogation; you 'do the alphabet', you hear them but don't really listen, what you are looking for is a word that begins with 'A', then one with 'B' etc. etc. When you get stuck go back to 'A' - it really works, you are thinking in a world of your own whilst they witter on.