Think that because they've flown with you twice and you've been really friendly, that gives them the right to phone you at 10.30pm and again at 7.15am to discuss their personal problems and tell you their life history, assuming you are now great buddies. This is all just after after you've breathed a sigh of relief at the end of the lesson, where they committed at least half the offences mentioned above, and you decided that you need a week to recover in order to be your usual friendly self.