Dipping cookies in milk is such a big thing that they even have different products you can buy to help the dipping process. I've seen little cookie fishing poles so you can dunk the whole cookie without putting your fingers in the milk. The fact that there's a market for that is amazing. People really love to dip. They love to dip so much that when the milk is gone, who cares? Dip in the OJ!
I totally get this combination, because it reminds me of those chocolate orange slices. They were big balls of chocolate cut into slices like an orange. The mixture of orange and chocolate was very good. Here you have that same effects but in cookie form. The only thing is if the OJ starts to turn brown from the chocolate. That is a lot less pleasant than chocolate milk.