Related:

• There's at least one fool in every married couple.
• There's one fool at least in every married couple.
• Every group has a couple of experts. And every group has at least one idiot.
  Thus are balance and harmony (and discord) maintained....
• Every group has a couple of experts. And every group has at least one idiot.
  Thus are balance and harmony (and discord) maintained....
• Every man is a damn fool at least five minutes every day
  wisdom consists in not exceeding the limit. -- Elbert Hubbard...
• In every non-trivial program there is at least one bug.
• Every interesting program has at least one variable, one branch, and one loop.
  .. and at least one bug!...
• O bei o brut se spusen tut. [Beautiful or ugly, every one get married.
  ] -- Dialectal Italian Proverb...
• Every program has at least one bug and can be shortened by at least one instruction -- from which, by induction, one can deduce that every program can be reduced to one instruction which doesn't work.