New Way to High Five?

We had an interesting conversation as the kids were heading to bed last night:

Madison:  Jacob and I high-fived with our tongues before.
Dad:  You and Jacob high-fived with your tongues?
Madison:  Yeah.
Dad:  That is sort of like kissing your brother.
Ben:  Yeah, only a lot grosser.
Madison:  Its like licking a lollipop stuck to your brother.
Ben:  How did it taste?
Madison:  It didn't taste like a lollipop for sure.

We had a difficult time to stopping laughing after this one.