As a house concert presenter, once in a while I get someone who comes to a show that makes you wonder why on earth they are there. Last time was the woman who complained loudly thru the whole evening, "I can't understand a word she's saying!" and kept asking for "Danny Boy". (Very well-known Scots singer that night.) She finally had to be asked to be quiet or take herself away. Bad luck of it was - she was my own sister.
I'm teaching her the handy phrase, "I'll get me coat..."