Any body ever been deceived by their own clock?

Well...I have. This morning. Normally I used to look at the clock on the wall rather than my watch or alarm clock. I walked out of my room at "8 o'clock" (according to my clock) and going to have breakfast "as usual". Somehow I looked at my watch and found that it said ... 8:30... Eh!? Not 8:00!? It looks like the battery had got flat. As the bus had left at 8:20, I had to wait for the next bus (8:50) to go to the LI and of course, I couldn't get to the LI on time today. I should have got more than one clock with me in my room...