Many years ago I attended a "Highlander" convention (Highlander was
several movies and a couple of TV series dealing with Immortals than
can only be killed if you remove their heads, usually with a bladed
weapon).

One of the actors on the show was a Welsh actor, Peter Wingfield.

Various attendees were asking the actors (sitting at a table) various
question. Except all of the questions were being directed towards Jim
Byrnes (another actor on the show).

Finally one lady got up and said: "I have a Peter question."

The laughter was quite sustained. So she tried to rephrase it. "I have
a question about your sword." This kept the foliks rolling for another
long while. Another rephrasing to refer to this sheath (scabbard)
didn't stop things.  In the meantime, Peter Wingfield looked quite
lost. Jim Byrnes finally leaned over and explained to him the slang
meaning of "Peter".

Just a reminder that not all english speaking cultures have the same
slang terms.