Crossword puzzle clue "fool me once on you"

"Fool me ___, shame on you; fool me twice ..."

" . . . no fool like ___ fool"

The fool in "A fool and his money are soon parted"

"Any fool can make ___, and every fool will mind it": Thoreau

Act the fool or, alternately, act the fool?

"Who's the more foolish? The fool, or the fool who follows him?" Jedi Master

"Shaqtin' a Fool" fool

He told the Once-ler, "Sir! You are crazy with greed. There is no one on earth who would buy that fool Thneed!"