That happened to someone on a Solaris / Sun Microsystems / Oracle forum I read and post at a few years ago.
Forum member's job, and actual whole department was outsourced to India. He was looking for work and had more time to spend on the forums and suddenly new members joined. They first started out with Solaris basics and then it moved onto more detailed questions and finally the new members quoted directly from the documentation our older member wrote himself (that was proprietary) and he realized he had been helping the people who replaced him.
So, he had a bit of fun with them "answering their questions the best he could".
Biting the hand that feeds IT
