Drilling down to the inner workings ...

Most of us don't give a second thought to what happens from the moment the ignition key is turned and the engine in the car fires up. And that's probably a good thing. But just for a moment, consider everything what has to occur in exactly the right sequence at precisely the right millisecond for the cylinders under the hood, to take that mist of fuel, compress it, ignite it and express the exhaust at the end of the power stroke. And that's every cylinder in your 8 cylinder engine, 1500 or 2,000 times a minute as you amble down the highway. On top of that, consider all those exquisitely machined parts, spinning past and around each other with bare fractions of millimeters of clearance ..... my goodness ... all the things that could go wrong at any moment.. 
Probably best not to think of this while 5,000 feet in the air, as your Cessna's engine does an unexpected stutter ...

Worse yet: staring at the ceiling as you lie in bed waiting for sleep. Just imagine all the incredible functions going on in your body every second without any conscious effort: heart pumping blood due to electrical stimulation, that oxygenates the blood going through your lungs, that whisks through miles of veins and capillaries, as your digestive system metabolizes the food you ate while watching TV, providing the energy ....... well, you get the idea. 
Makes waking up the next morning kind of an adventure.