All my life – I mean, seriously, I think I first heard of doing this when I was young – I have wanted to try turning bones into rubber with vinegar. I never did it when I was little, & never got around to it when my kids were little. Luckily grandkids are on the scene now, so we have finally made it happen. We put the bones in a jar, filled it with vinegar, & left them for three weeks. Sure enough, it worked like a charm. You could bend them, and they were squishy exactly like a rubber ball. Bizarre – and fun, and so glad I got around to doing it at last!