Question: Where did the superstition knock on wood come from?
Answer: German folklore
Disambiguated annotations:
qaPairs: question: Where did the superstition knock on wood because of protection from supernatural beings come from?
answer: Celtic or German folklore
question: Where did the superstition knock on wood to distract spirits come from?
answer: Pagans
question: From what object did the superstition knock on wood come from?
answer: wooden crucifixes
question: What is the more modern theory for where the superstition knock on wood come from?
answer: a form of tag called "Tiggy Touchwood"