Rainman

"L 68466557 J" Ethan says to me as I'm hugging him goodnight in his bed. "What?" I asked, puzzled as to what he might be talking about. Then, I go to the place that I had tucked his dollar bill away for him so that his siblings wouldn't steal it away from him sometime tomorrow when he's not looking. Sure enough... there are some numbers that sound like what he said, so I say... "Ethan... say it again." And as he says the numbers, I read along "L 68466557 J". My son has memorized the serial number on his dollar bill...