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The worst thing you can do to make someone scream like a baby. It's like giving a goat a wedgie. Everyone has one, and yours is probably covered in poop.
My mom's button is when she hears the word 'honey' from my dad.
My button is when someone says 'you're overreacting' while I'm yelling at them.
My button is when I hear someone say 'I told you so' after I failed a test.