I think it's a little funnier than your tl;dr: in particular, a member of the math faculty, who has a sandwich named after him and who is friends with the owner

I think it's a little funnier than your tl;dr: in particular, a member of the math faculty, who has a sandwich named after him and who is friends with the owner, was a little bit too preoccupied with mathematics to fully engage with the sandwich ordering process.