Last night as my daughter was getting into her bed, I noticed her slip something under her pillow. When I asked her what she was doing, she pulled her hand out from under the pillow and showed me a tooth.
Mildly surprised, I asked "did you lose a tooth today?".
"No," she replied. "I found it."
"With mommy's stuff." (My wife keeps her [haha! my daughter's! Fixed 11:00 PM] lost teeth in a small box. It's supposed to be secret because usually the Tooth Fairy takes her teeth and leaves her a coin.)
"Well," I said, "if you didn't lose that tooth today, why are you putting it under your pillow?"
She shrugged and said, "it's just a test."
It's difficult to properly express how amused, tickled, and impressed I was at that moment.