I inferred in a previous post somebody was naive to think it wouldn't happen, they took great pleasure in being offended by the remark so I'll not say it again, but unfortunately it seems to be human nature for a lot of people.
Some people would be appalled at the thought of theft from work, but it happens all the time, browsing the internet, ordering goods on line, checking Fleecebay, checking Faecesbook, going in 5 minutes late, slightly longer lunch, slipping away early on a Friday, calling at the supermarket whilst out on a job, all these are theft of time from the employer.
I reckon I could 100% guarantee that in both of your places of work it happens, it's you don't class it as theft.