If I knew what I had done, you can bet I've never do it again.
I've made only gluten-free bread before this in this Breadman machine with no problems. This time I was making a Challah, which I've made many times before in my old machine, a Regal, probably circa 1996, which I bought for $5 in a Moab second-hand store. I don't have the attribution of the recipe, but I have a feeling I found it either on eGullet or through a connection to eGullet.
What I did wrong...I have no idea. None. Not a one.
At least it's good for a laugh.
Added: It still tastes good.