Oh, well then I want to give her a call. If I DON'T know her then I don't care if she's worried about you.... Only if I know her.... Also, I'm going to call her even though you didn't tell me her name and number because I only know ONE person. :D :D :D
shareJudging by the resemblance comment and Marty telling her that maybe she did know his mom, then how could his grandma doubt herself and not be certain she was gonna call the right mother? XD
The line is clearly there to joke about the obvious (Marty’s mom is sitting right next to him... and ogling him). Love the awkwardness of that scene.
"The line doesn't make much sense alright, but it's clearly there for the whole Lorraine and Marty mom/son joke. Love the awkwardness of that scene."
Exactly. This is the kind of details to which you shouldn't give much further thinking because they simply serve a purpose to bring a punchline or a joke.