I used to work in a Tesco Express store, frequented by an elderly, blind man who requested our services to source the items he needed. This happened in the days before I worked with the disabled so my tact and manners were immature in this sort of situation.
I noticed he was dangerously close to scraping his face against a plastic separator in the chiller and told him loudly to 'watch out!'.
He enquired as to whether we stocked a certain spread. I couldn't find it so I loudly said to a colleague 'do we have any flora or am I just blind?'
I honestly don't know why he didn't complain.
My mother and I were at the checkout of a shop. A young lady with a half shaved head, pink hair on the other half and some moody clothes on exited the shop. The lady in front of us at the checkout turned back to my mother and said 'she looks a right bloody mess, what's going on these days?'. My mother said 'oh I know. Makes YOU look good doesn't it?'
I started to snort and sputter, then my mother realised her mistake and began chuckling herself. The woman in front of us asked us why we were laughing. So, she hadn't caught the inadvertent backhanded compliment and now it was to be explained to her, so that she could catch up both on the accidental slur and the reason we were laughing, and then take offence at the laughter.
I couldn't cope with the hilarity of the escalated situation and wandered away for a while, leaving my mother to stick her nose in the air and pretend she was in a bubble through which nobody could penetrate.