Just an oddity I ran across... I recently went through my 2020 weekly cards and created some base sets with Wonky and Guest artists cards, etc. With some of the extra base cards, I made a pile and use to stick on the back of envelopes when I do trades. I recently used a few and ran into some that, when I peeled the front and the back apart, I found that the puzzle piece has the sticky back, not the Wacky. Since other than this, I don't normally peel and stick Wackies, I would not have known. Now, it makes me wonder how many are backwards like this.