Yes I have. When "C" was my FT sup for 5-years, nearly every single check was off by 5-10 minutes. If you questioned him, he'd threaten you 'hey Bagels, if you really wanna complain about a couple bucks, I'll follow you around the building and show you where you're stealing time and take that away from you.' Pretty well known that he shaved a minute or so off most employees most days. He was forced to resign over it a few years ago, but only b/c he p'd off upper management (they were fully aware) on something else.
Arguing over it put a target on my back, so I reconciled with a 15-minute dump once a month or so.