They had to cement the dining area because people used to bury the plates in the beach sand.
Interesting. I’ve always seen this as a signal that a person was stepping away, but coming back. The person would cover it while going to the bathroom, in part so it isn’t as trivial for someone to slip something in their drink. Implying that they intend to keep drinking it once they return.
I’d be interested to know where it means that the guest doesn’t want any more beer.
Works for preventing insects from flying in when sitting outside though.
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