Overheard someone giving someone the complete wrong directions earlier on, a car had pulled up and the woman in front of me on the street was asked quite loudly where a particular street was, she was going on a bit and very chuffed with herself and keen to be of help ..the driver went on his merry (wrong) way and I was left feeling that I should have butted in and corrected but I didn't because of fear of embarrassing the helper ! AIBU in thinking it was best to keep my gob shut ? 