Isaac was playing by himself with hot wheels cars when I saw him do the most surprising thing. He went into the kitchen and pulled out a few ziploc slider baggies, then he proceeded to put the hot wheels cars into the baggies and zip them shut. I watched him take the cars out and put them in again and again.
This event might not be noteworthy, except that Noah used to do the exact same thing when he was Isaac's age. He helped himself to slider baggies all the time and entertained himself by putting toys in and out of the bags. Noah has since stopped playing with the baggies, and I'm pretty sure that Isaac has never seen Noah do it. It was amazing to watch Isaac do the exact same thing!