What I found is that written evidence for knocking on wood (and for the history of gesture as a whole) is remarkably sparse. In the Penguin Guide to Superstitions, folklorist Steve Roud offers a skeptical take on the provenance of knocking on wood due to the near total absence of written records about it:
The page was reconstructed using internet archives from 2006
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As Clavicular and his antics become embedded in our culture, so does his ideology. It's not a coincidence that his rise is occurring at the same time as Trump is once again in power, and as the ideal for women's appearance becomes smaller and thinner.
Mark SavageMusic correspondent