Turpentine!
Little boy is sitting on the curb shaking a can of turpentine. A priest passes by and says "What ya got there son?" The boy answers, "I got the most powerful liquid in the world." The priest responds "Well son, I think you might be mistaken... holy water is the most powerful liquid in the world. Why... if you rub it on a pregnant lady's belly she will pass a beautiful healthy baby." The boy thought for a minute and then said "Well sir, I mean no disrespect to disagree, but if you rub this on a cat's butt it will pass a Harley Davidson!"