www.bbc.co.uk/news/uk-england-cornwall-30876360
Long story short: dad accepts invite for his son to attend v expensive birthday party, realises son is double-booked, doesn't bother to send apols to birthday party.
Mother of birthday child sends invoice for charges to dad for the cost of the birthday party ticket.
Obviously, she's being ridiculous - but so is he, with his sadface photo and his victim air. He was being rude, and if he had the contact details to accept the invite, he had the contact details to send apologies.
(I think Invoice-Sending-Mum probably just snapped!)