I was employed as a software tester once and a woman who didn't like me sat on the bug board and everything I submitted was immediately closed at the next meeting as "not reproduceable". Within a couple of weeks a customer would inevitably find and report it and it'd get immediately corrected.

One of the developers thought I was being paranoid and sat down to have me write up a report of a bug he'd found and when it was closed, he threw a fit, but she just kept doing it until I willingly changed departments.