Oh yeah, one of the companies I work with had an employee go into management and he just instantly turned into a c*nt in a way that I'd previously not believed possible.
This is the LAZY guy who spun jobs out, but now expected them to be done faster then genuinely possible.
The guy that used to knock off early every day, but suddenly started turning up on jobs ten minutes before knocking off time on a FRIDAY.
The guy who still makes idiotic changes to cheaper materials and plant that makes the job harder and inferior.
To demonstrate how much extra labour and time he used to put on his own jobs... I do one of his where he used to take 8 weeks with 8 guys. I do it in six weeks with two guys and half the plant!