If I Kiss You, That Is An Psychological Interaction.

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If I kiss you, that is an 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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