If I Kiss You, That Is A Psychological Interaction.

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If I kiss you, that is a psychological interaction.

On the other hand, if I hit you over the head with a brick, that is
also a psychological interaction.

The difference is that one is friendly and the other is not so
friendly.

The crucial point is if you can tell which is which.
-- Dolph Sharp, I'm O.K., You're Not So Hot

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