The “Knocking on Wood” Wikipedia page mentions Roud’s conclusion, and this claim of a 19th century origin has circulated online as the final say on the matter. If you go back to the original, though, Roud’s proposal actually ends on an ambivalent note: “Before this theory [of 19th century origins] can be finally accepted, however, an examination of the history of European forms of this custom would be advisable.”
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But the watchdog noted the humour was "generated by the humiliation and implied threat of painful, non-consensual penetration of the man".
"It was a matter of arriving on location and seeing the sun go down to get into position to wait for the sky to darken."
Final Hurdle hintHits the slopes.