Took apart my lawn mower

I couldn't start my lawnmower yesterday. I don't know anything about lawnmowers, really, but I figured if I took it apart I could maybe see what was wrong. I took it apart and couldn't see what was wrong. When my wife asked me to show her, I reassembled it, but then it unexpectedly started up fine. Lawn-mowing accomplished!

I didn't do anything...honestly I have no idea. I guess the lawnmower equivalent of "did you try turning it off and turning it on again" is "did you try taking it apart and putting it back together"!