Inspired after reading the post about the twat who stood and watched the OP reverse her car in to a bollard and then laughed at her....
Has anyone been an utter arsehole to you/someone you know and you had the great pleasure of witnessing their comeuppance?
For example - once DH and I were driving through the peak district on winding country lanes and a white van driver was aggressively tailing us and then dangerously overtook on a blind bend... 20 mins later we passed him and he was pulled over by the police and stood by his van looking very sorry for himself 
Ahhh karma can be a bitch!