Joshua making me laugh again

So we are shopping in Sam's club and the boys are sitting in the front of the shopping cart together right next to one another. Joshua is being silly and making Samuel laugh when Samuel starts babbling, "ba ba ba ba." So I say to Joshua, "He's saying your name!" Joshua gets really excited and says, "he is! he is saying my name" and is smiling from ear to ear. He then gets a very serious look turns to Samuel and says, "actually my name is Joshua."