I (almost) literally had this happen once before. Though in their defence, I did sue them for wrongful dismissal and won significant (to me) compensation.

A year or so had passed and I'd had some good friends working there. I was passing by, so figured it wouldn't hurt to pop in and say hello. Stepped into the workshop, was spotted by the foreman (who was the boss' son) who told me, in no uncertain terms, to fuck off.

So I fucked off.