Two's Company

Bigamy is having one wife too many.
Monogamy is the same thing.

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There once was an old man of Lyme
Who married three wives at a time,
       When asked, "Why a third?"
       He replied, "One's absurd!
And bigamy, sir, is a crime."
--William Cosmo Monkhouse (1840-1901)

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A bachelor is a person who never makes the same mistake once.

(Very cute, but let me quickly go on record as disagreeing with almost all of it, dear.)