It is often considered rude or impolite in some cultures for one or more of several people sitting around a table to have their car keys out on the actual table surface itself, as if to show everybody what nice a choice of vehicle they made.
This makes feel some insecure types feel inadequate, but not all find it offensive, though, and one does get to see a diverse selection of ignition keys, cards (some Renault models) or Emotional Control Units (for newer Aston Martins) in this way.
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