I can see it now:
Guy1 looks over at guy2 filling his car with gas at the gas station. Guy2 then proceeds to put something in his gas tank. Guy1 looks over with curiousity and asks "what are you doing?" Guy2 responds, oh I'm just crushing up a vitamin to put in my gas tank--I've got to feed my car this vitamin at every fill up so it stays healthy and grows strong bones.