People don't know that Trump's riff on John McCain was based on a scene from Woody Allen's 1998 film Celebrity. The scene is a nasty old grandma surrounded by her adoring family, saying "What's he famous for? For being captured? Why is he a hero? Itโs no feat to get captured."
Trump is in the film in an unrelated scene for about 10 seconds.
I've never seen anyone report on this, but it's clear to me where he got his lines.