A frog walks into a bar.
At the bar is a scorpion.
The scorpion says "hello there stranger" and tilts his drink in salute, bewildered the frog has his drink and returns home.
The frog returns the next week and again, "hello there stranger", again nothing further occurs. This pattern continues over the span of years and years occasionally the frog responds in turn. Ten years after their first meeting and the Scorpion says, "Do you think our relationship is superficial?"