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A friend of mine once went to Steak 'n' Shake and attempted to order cheddar fries. But when she spoke, she instead asked for “frizzies”, and she didn't even realize she'd misspoken!
I went to the movies with friends once, and someone said, “I want popcorn.” I must have misheard, because I had to ask, “Did you just say you want cock porn?” To be fair, with my circle of friends, it wouldn't be entirely crazy to say such a thing in a cinema or random other public place.