American here and both of mine were in England. When I was 17, I was transiting through LHR and was grabbing some food on a layover. I asked someone in a cafe where the "silverware" was. She had such a perplexed look on her face, poor thing. It took a second but I realized my faux-pas and said I was looking for "eating utensils" and that cleared it up. I think she must have envisioned me asking for silver platters, silver cuttlery, and wine goblets eating like a king at the airport restaurant.

The second one was more recent but irritating because the person was really snotty about it. I was asking about tickets for something at the Leicester (Lie-CHESS-ter) Theater. Her response was "I don't know WHERE the LIE-CHESS-TER Theater us, this is the LESS-TAH Theater." in a very sarcastic tone. Sorry I don't know every weirdly pronounced English word. Oh well!