Or the time my dad and I were going by the post office when I was little, and he asked me to remind him to pay for the ‘porto’, postage.
When we get home and my mum greets us, I say "dad did you pay for the porno?:
Not quite the same thing but a lady I know is Polish. She gets her llanguage twisted around, and one time I thought she was saying that her and her husband had been converted by the Jehovah’s Witness. The smile quickly faded for my face, until I realized she just mangled the sentence somehow, so it meant the opposite. I’m still scratching my head LOL I nearly pissed myself laughing though
When i was 8 years old I tried to say “this food is yucky” and instead I shouted “this is f-cky!” I was grounded so hard and still cringe thinking about it.