After this comic ran, more than one mechanic wrote to thank me.
The largest auto repair I ever undertook myself was replacing the water pump on a 1962 Fairlane. Because of the length of the bolts holding the water pump on, I had to pull out the radiator to remove it. Also, because I did not have ramps or jack stands, I ended up digging a trench in the ground, which I rolled the car over, then crawled down into.
Knowing that the car only ran because of my hard work gave me a great sense of accomplishment every time I started it up. Also, knowing that it only kept running because of the quality of my work cause me to never trust the car again.