I uses to do help desk; I showed up 15 minutes to have my cups of coffee as I browsed on my phone. End users complained that they saw me not doing anything/assisting them as I was off the clock.

Boss told me to knock it off and work. So I ended up showing 15-30 minutes early to work and clock in that sweet extra time. Near the end of my employment, boss complained to me that I been racking in too much overtime.

Make it make sense.