Don`t ask me how I know-
Even though the air supply is turned off don`t stick your face in front of the sandblaster nozzle when trying to unclog it as there may be some compressed air still in the hose!
Don`t drop your air hose onto the concrete floor when done painting if you have one of those plastic water traps on the end as they break and blow dirt everywhere all over your fresh paint job!
Don`t forget to change out the straight water in your drag cars new engine for antifreeze befroe winter!(not me,buddys Monza)
Don`t screw your dome light in with a 1" long sheet rock screw as the distance between the inner structure and the outer roof panel is only 1/2-3/4"!(again not me,buddys Camaro that I just had to fix and paint for him)