I always feel bad when someone is making a lot of effort in English but I can't understand and have to ask them to speak in Japanese. But... Not my fault if I'm not an native English speaker and can't understand other non-natives accents.
Someone from Setagaya-ku city office just called on my phone, switched to English mid-call and... I didn't notice, wondered why I couldn't understand his Japanese all of a sudden.
Had to ask him to repeat... in Japanese 
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Wooo Setagaya~ that’s our sister city (and where I lived)!
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I don't live there anymore but I still have to pay their taxes...
End of conversation
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