Everyone wanted to use someone else's toothbrush tonight. "Mommy, can I use the green one? Mommy, can I use the pink one tonight?"
"No," I answered over and over. "You have little germs in your mouths, and if you use each other's toothbrushes, you will get the germs from each other."
My budding lawyer found the ultimate good reason for trading toothbrushes. "But Mommy," she pointed out, "if we got each other's germs, that would be sharing."