So now if anyone has come here looking for an actual post...
I've had a couple of calls from some college kids renting a house that I manage. One was because the lights had gone out on the main floor, and "it's too dark right now to go down to the basement to check the generator." Generator? I'm not sure what he thinks is powering this house! :) By the time I got the voicemail and called him back, one of them had managed to brave the dark basement and flip the breaker back on.
Another time, the thermostat battery died, so the heat wouldn't come on. It was 9:00 at night and starting to get cold, so they didn't want to wait until the next day, if possible. So I went over with some batteries, popped it open with my fingers, and changed the batteries (2 AA). When they saw how easy it was, one of them said, "Oh, we could have done that!" Another one said, "I didn't realize it was just the thermostat. I thought it was something with the furnace." Good thing I only live 2 minutes away!
I'm not sure these things count as "dumb," really. They've just never owned a house or had to mess with any of these things.