When you're just 11 and "helping" a grownup work on a car, it's not a good idea to hit the brake pedal while the drums are off....

When you're 18 and rewiring an antique car, do not use the old "twist and tape" method - you'll go slowly crazy.

When you're 18 and pouring a little gas in a carburetor to get a car started, it's best to use a very small container rather than a half-full 16 oz cup - just in case it backfires....

When placing a plumbing truck on a service station lift, it's a good idea to move the truck farther forward than normal to compensate for the added weight of the equipment and supplies in the back - that way, you won't have to change your underwear...

When adjusting the carburetor on an older running lawnmower without the safety shut-off handle, it's a good idea to keep the tip of your finger out from under the lip of the housing...