Spotlessly clean
After I had grown up and become a man, my father and I were seated in front of the TV, during a football game’s halftime exercises.
Dad remarked, “Son, every time I gave you a whipping when you were bad, you’d go into the bathroom and spend about 30 minutes, scrubbing the toilet. You got it spotlessly clean, and I could never figure out why you did that.”
Without taking my eyes off the TV, I replied, “I was ‘getting even’ with you, for whipping me.”
Dad, startled, replied, “How? By cleaning the toilet?”
“No,” I answered, “by scrubbing it with YOUR TOOTHBRUSH.”