Then there is always the time when you ask "Would you like tea or coffee?" and they just hold their cup up and say not a word. Since when did we become "mind readers????"
And......
After briefing the pax in the emergancy exit row, there is always one that has to say " oh yes I can assist, I will be first out!". Gawwwd, if only I had a dollar for everytime I have heard that!