I sometimes wonder if the manufacturers of foolproof items keep a fool or two on their payroll to test things.

Coren’s joke plays on the modern promise of “foolproof” design—products so simple or safeguarded that even an incompetent user can’t misuse them. By imagining manufacturers employing “a fool or two” to test such items, he satirizes both marketing language and human fallibility: if something can be used wrongly, someone eventually will. The line also hints at the arms race between designers adding protections and users finding new ways around them. Beneath the humor is a practical truth about usability testing and the limits of engineering against error.