Fool me once, shame on you. Fool me twice, shame on me.
— English Proverbs
Vibrant Fool Me Once quotations
Fool me once, shame on - shame on you. Fool me - you can't get fooled again.

If you deceive me once shame on you because I have trusted you once and you have deceived me, if you deceive me twice shame on me because I have learnt my lessons and you have deceive me and if you deceive me for the third time shame on me because am a compound fool.

As the adage goes, 'fool me once, shame on you.
Fool me twice, shame on me'... It's time for patriots everywhere to rally together again and take back America.
There's an old saying in Tennessee — I know it's in Texas, probably in Tennessee — that says, fool me once, shame on — shame on you. Fool me — you can't get fooled again.
Fool me once, shame on you. Fool me twice, shame on you.

Even a fool learns something once it hits him.
Fool me once, strike one. But fool me twice ... strike three.
You can fool me once, you can even fool me twice, you can even fool me thrice.
But you can never fool me four

Somebody once told me that if you laugh at a George Bush joke, or you send an email cartoon to your friends that makes Bush look like a fool, you feel like you've done something significant. But really, what have you actually done? Just expressing contempt for your leaders doesn't really accomplish anything.
I wasn't playing the music, the music was playing me.
.. and once that went away, and I had the feeling I was playing music, I had to stop. The need to go onstage and get my brain flattened every night left me, and what I didn't wanna do is go onstage and perpetrate a fraud... You cannot fool an audience.
"OK, well everyone makes a mistake, right?" But then when you think it probably happened again that's when you think: "Shame on you once and shame on me twice, or however that saying goes." But everyone's been down that road. It's not about the little things anymore, but the major things that tell you if you don't move on at that point then I'm a fool.

Like my old mentor would always say, Fool me once, shame on you, fool me twice and I'll be dead.'' Okay, she wasn't a good poet, but that lady could handle her whiskey.
I really do believe that there are those who would like and trust me better if they saw me weeping into a whisky, making a fool of myself, getting aggressive, maudlin and drunkenly out of control. I have never found those states in others anything other than tiring, awkward, embarrassing and fantastically dull, but I am quite sure that people would cherish a view of me in that condition at least once in a while.
Do you think I am a fool, Masha? All this time, and you speak to me as though I were a flighty pinprick of a girl. I am a magician! Did you never think, even once, that I loved lipstick and rouge for more than their color alone? I am a student of their lore, and it is arcane and hermetic beyond the dreams of alchemists. Did you never wonder why I gave you so many pots, so many creams, so much perfume?

DON PEDRO Come, lady, come; you have lost the heart of Signior Benedick. BEATRICE Indeed, my lord, he lent it me awhile; and I gave him use for it, a double heart for his single one: marry, once before he won it of me with false dice, therefore your grace may well say I have lost it. DON PEDRO You have put him down, lady, you have put him down. BEATRICE So I would not he should do me, my lord, lest I should prove the mother of fools.