NC for this.
My grandma was a lovely lady and I relishes going to stay with her in the school holidays! She just happened to have a rather booming voice with a very strong West Country accent.
We were in a local cafe and she was jovially saying how nice the food was. 10 year old me - completely without thinking and probably trying to make a joke - said:
"Grandma, do you realise just how loud you are sometimes?".
Her face instantly fell and she went really quiet. My mum told me off and I must have apologised, although I don't remember. She died in 2006 and I still can't get her crestfallen face out of my head to this day. She didn't deserve it, and I still kick myself.