I have a diaper station set up in our living room and bedroom for Molly. Periodically, I ask Henry to run and get me a diaper from the bedroom. I couldn't figure out why he kept digging through the entire bin, getting them everywhere. Or, why he would bring me more than one and then toss the others somewhere like they were garbage.
After a bit of investigation, I determined that he only wants his baby sister to wear the diapers that have ELMO on the front. All others are un-wearable in his tiny mind.