One of my pet peeves is in room hotel clocks which are wrong or which have an alarm just waiting to go off in the middle of the night - like the way Hilton rolled out a consistent set of clocks years back which consistently showed a different incorrect time in every hotel room in the world. Even if you don't trust your housekeeping and quality control to set a clock, it's not like the technology to centrally set time and avoid recurring alarms has yet to be invented.

If a digital clock is showing the wrong time nowadays I'll generally unplug it so at least when I check out the staff are forced to plug it in and have a chance of trying to set it to the right time.