Making eye contact on the tube. 
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"Great, I'm heading in the same direction." 
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 "would you mind sharing this table?"
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 Someone going in for a second kiss on the other cheek.
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Is that seat taken (points at seat with bag on it) 
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"let's all go around the table and say a little bit about ourselves"
:
Funny enough but Canada has already reached this level of de-socialization and paranoia of others years ago.  Canadians already live in a high threat level environment.