This post is meant in good humor. Please add as many as you can think of.
Anyone who has worked on automobiles (or motorcycles, boats, planes, you name it) has noticed certain fundamental laws of mechanics. Here are a few that I have noticed.
1. Any round tool dropped outside of a vehicle will roll to the exact geographical center of the vehicle, or the side furthest away from you.
2. Any tool dropped into the engine compartment will fall into some hole and disappear, never to be seen again.
3. The bolt hardest to reach is the one that's seized.
4. The tool you have in your hand is not the one you need.
5. The last screw, bolt or nut is the one you strip.
6. The replacement cost of any part is in inverse proportion to it's size.
7. The location of break down is always at a geographical point furthest away from your point of origin.
8. The part you really need takes 3 weeks to locate and a month to ship, while the Porsche badge for the hood will arrive via overnight.
9. The 12" extension is too long and the 6" is too short.
10. The local Auto supply house never, never has any of the parts you need, but somehow manages to stock an entire engine gasket set for a Yugo, or an oil filter for a DeLorean.
Again, this is a humorous post so please add as many as you can think of.