I used to work at a cafe and one day as I was working the register a couple came up. They were clearly giving me what they seemed to think were surreptitious glances and whispering to each other so I was already a bit intrigued as to whether it was me or the muffins that had drawn their attention.
They walk up to the counter and the man with a super eager look on his face starts talking in gobbledygook. Or at least that's what I thought at first, but then he stopped and smiled at me with an expectant look on his face. Then it hit me, they were trying to speak with me in one of several hundred languages from India. I don't know which one it was, but I did know it wasn't one I could speak. I apologized and explained that I didn't understand that language.
And with a look of utter shock and disappointment he goes, "But it's Indian! You're Indian!" Again I explained, yes I am Indian, but there are a lot of Indian languages and unfortunately I don't speak that one. I smiled and asked what they would like to order hoping for the exchange to end, but he just kept spluttering about how "It's Indian. I traveled through India, it's Indian," while his wife nodded in agreement.
All I could think was, "Sir, it might as well be Khoisan, cuz I'm still not gonna understand it."