I don't recall, but story is that my brother tricked me into eating worms when I was very little. He did so by "eating" some first. He kept them in his mouth until I ate one. Not sure his logic was sound.
I did get him back some time later, we had a cow pie fight in the pasture and I got him, well, right in the pie hole. He was a couple years older than me, so I took a few lumps for that.... Worth every hard knock....