The majority of people at work are very sensible - staff and managers alike.
We do occasionally get someone who takes the piss which then results in a crackdown that affects everyone.

The last time that happened was one of our field engineers that worked on call who started trying to rigidly enforce his entitlement to an 11 hour break between shifts.
He'd finish the normal working day at 5:30pm so if he was called out of hours at say 11pm and then 6am he would insist on the 11 hour "clock" being reset each time, and send an email in saying he wouldn't be at work in time, even if it was only a 5 minute phone call he'd had to deal with. Get a call at the wrong time and he would basically refuse to come in to work the next day cause he'd done ten minutes work on call.

Given that he was paid £250 per week for being on call, plus time and a half or double for any hours worked this was seen as taking the piss somewhat.