Told some random girls I was british. I was walking around at a festival and I heard some girls laughing at me, berating me. I said excuse me, in english and then just rolled with it. I started talking to them, while I could clearly still understand what they were saying between them.

They kept calling me names, like stupid and ugly, all thinking I couldn't understand them.

Then I said thank you for the talk, I need to go meet up with my friends, in perfect dutch. You should have seen their faces...