At a meeting of the U.N. General Assembly in New York, there was a break for lunch. The American ambassador & his wife are heading for the street when they see the Russian ambassador, Rudolph Velinski, leaving, carrying an umbrella.
   The American says to his wife, "We'd better get our umbrellas."

"Oh, why?", she asks.

"Because Rudolph the Red knows rain, dear."


(I heard this many years ago, 'almost' like the above, but versions of this online are widely varied, but all telegraph the punchline and contrive unlikely situations.) I like jokes to flow sensibly..until..