I was studying Colossians with Middle Daughter the other day. Got to the part where Paul warns his readers about people who will beguile them with enticing words. It's in the "vain philosophy" section. One conjecture is that the heresy in question was an early form of Gnosticism, so I was trying to explain a little about Gnosticism to her. I got to the part about how the Gnostics tried to create mysteries and then told people that they could be part of their secret "club" by going through an initiation ceremony. People thought this was pretty cool and that they would be profound thinkers like their teachers if they learned this hidden knowledge, but really it was all nonsense.
To which she replied, "That's sort of like postmodernism. Where they say that yes and no are the same thing."
Yes, sweetheart, very much so. Right on.