What, if any, sanctions are appropriate for a 9 year old who ignores repeated requests not to butt in to adults conversations asking 'what?' and who will lean over to look at things adults are reading or writing - blocking the readers view?
It's not cute and endearing like it might be with a younger child - and I'm worried he's going to get into trouble because this isn't just with people he knows well - he does it to people like sports instructors and drs receptionists, too!
Gentle, and more recently, fairly robust reminders don't seem to make any difference as it can happen several times an hour and he's starting to backchat when he is asked to move away or not interrupt now - defending his behaviour by saying that he 'wants to know'.