When I was quite small, say 15 or so years ago, I used to sit in my parents sink and smear a combination of toothpaste, soap, and water all over the mirror. I also would drop the toothbrushes down the drain. My parents had to buy only chunky handled toothbrushes, because I was a master tooth-brush detective. For the first three years of my life, this was how the mirror looked, despite regular cleanings.
In fifteen or so years, I have matured.
I no longer drop toothbrushes down the drain.