Fool me once, shame on you; fool me twice, shame on me.

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Fool me once, shame on you; fool me twice, shame on me.

You should be hesitant to trust someone who has already tricked you. Is Ralph just going to pop out from behind that door again? Come on, fool me once, shame on you; fool me twice, shame on me.
See also: fool, on, shame

Fool me once, shame on you; fool me twice, shame on me.

Prov. After being tricked once, one should be wary, so that the person cannot trick you again. Fred: Would you like a can of peanuts? Jane: The last can of peanuts you gave me had a toy snake in it. Fred: This one really is peanuts. Jane: Fool me once, shame on you; fool me twice, shame on me.
See also: fool, on, shame