When I was a little kid, I remember lying in bed looking at my clock. I came up with the following puzzle.
A woman goes to bed without setting her alarm. She has a restless sleep and wakes up to look over at her digital clock. She makes note of the time and goes back to sleep. She lays in bed for exactly five more minutes before looking at the clock again. As she lays staring at the clock, another minute passes and she realizes her clock is upside down.
What time is it?