I could probably hollow this out and move in. This was three feet from the bikepath. Hundreds of middle school kids probably walk past this thing every day: it's a miracle it survived.
Puffballs (Calvatia gigantea) are actually decent eating when they're baseball-sized or smaller. This one would taste like moldy sawdust. In other words, add enough garlic and it would be edible.
I put a quarter on it for a size reference. As I said, it's a big one. But they get bigger. And apparently they can be used as airbags. Only in Wisconsin...
P.S. This is my 300th posting on my blog. That's either really cool or really pathetic. If I were putting this energy into my book I'd be done with two by now. Maybe I am in some way.