It is meant to be something you don't normally do.
A better example is how there are Afghan horse traders who broker deals and when the deal is concluded they make all parties bend down touch a finger to the ground, because that is something a person would not normally do around horses. If there is a complaints that they didn't really mean it or that they were tricked the deal then the broker can say, "You touched the ground. You agreed to the deal."
It is meant to be something you don't normally do.
A better example is how there are Afghan horse traders who broker deals and when the deal is concluded they make all parties bend down touch a finger to the ground, because that is something a person would not normally do around horses. If there is a complaints that they didn't really mean it or that they were tricked the deal then the broker can say, "You touched the ground. You agreed to the deal."
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