Second hand embarrassment

Lately I've been experiencing a lot, and I mean a lot, of second hand embarrassment. By this I mean I've been with or in close proximity to people who have done something embarrassing and that embarrassment has then transferred onto myself. My latest encounter of this was with my mum who ran from a pound land till so she could get the buy one get one free deal. This left me to stand with a line full of people starring at me with the 'omg what the hell is she doing' look. So from these encounters I thoughts I'd give some tips on who to deal with these situations. 1) stay calm if you make a fuss even more people will notice 2) keep at a safe distance 3) just smile and nod like you can't even tell what's going on and finally 4) remember you can't control someone, it's not your fault so just let it happen and move on and never look back.