Characters
Well, yeah, she asked if she could finish my peanuts and I thought she said something else.
— Pete Becker · Friends

Behind the line May contain spoilers.
Our reading
An editorial interpretation.
A request about finishing peanuts is followed by the admission that something else was heard. The misunderstanding is clear, but its alternative wording is left unstated. That omission gives the listener the missing part of the joke, while the speaker’s explanation stops short of naming it.
Context reviewed