While I was in the bookshop, I picked up a book to browse which had a chapter about dowsing. It says you can use a chain with a pendant to dowse. I remember I used to dowse years ago but I'm no longer interested in it.
About half an hour later when I was walking home, this guy approached me and asked me if I would like to buy a gold chain. He said he could offer me a good deal. I told him I wasn't interested.
Now that's what I call a chain reaction.
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