What are the things about Glasgow that every Glaswegian knows, but most outsiders wouldn't?

having a debate with a friend who insists that all British cities are essentially the same bar change in accents and a small differences in cuisine, and I need some facts to disprove him

My argument is that most cities have cultures, phrases, stories, icons that are unique to them. These are probably seared into the psyche of residents, but most outsiders wouldn't have a clue they exist.

So I guess my question is what are those big things that everyone in Glasgow knows about/loves e.g. the traffic cone on the statue