Even further - never, ever, stop doing a thorough walkaround. That bloody beast with wings will try to kill you one day and you better have a look at it
...
Seriously, you will find things your whole flying career long upon inspection. Last week my hangar neighbor was leaving when I had a look around and saw a screw lying on the ground, where his plane used to be. A quick look revealed - a prop screw ... took the hand radio and was lucky to reach him while still taxiing = he had lost two screws already.