A buyer gave me negative feedback on ebay so I sent Jacamo catalogues to their house. Still cackle when I think about them receiving a Jacamo catalogue every month.
I almost caused a work incident the other day by pettily refusing to let someone take the last GBBO sweepstake slot because they hadn’t brought their money, despite the email clearly telling them they had to. Did not go down well
This made me cackle with glee