Riddle me this...

Okay, one more post for the day. I haven't given a riddle in a long while. If you ask an almost 3 year old and an almost 4 year old to choose a cup from the following colors - yellow, orange, or purple, which color(s) will they choose? You're thinking I'm going to say that they both chose orange or purple or even yellow aren't you? Wrong. One chose green and the other chose blue. Seriously people. WITH A VISUAL!!! "Green is not an option. Would you like yellow, orange or purple?" "Green." From the other one, "And I want blue!!" I give up!!!