I've got 3 linked accounts with HSBC. As I was out of HK longer than planned I did not get to put money into one of the accounts as normal and so it went overdrawn. Despite the fact that there was more than enough in the other accounts I received a shitty letter saying I had an unauthorised overdraft and if I did not remedy the situation in 10 days they would close the accounts.
Amount of unauthorised overdraft? HK$3!!!! (no not 300 or 3000 but THREE dollars).