When we were watching the new Star Trek movie a couple of weeks ago, the Bomber leaned over and whispered, "I think the ones with the pointy ears are the Treks and the other ones are the Stars." Trekkie lore is acquired a posteriori (sitting down in front of a screen) as opposed to a priori it seems.
I've only discovered since watching the film, that Spock's mother was played by Winona Ryder. (Plot spoiler: Anyone who can watch the scene in which she dies without laughing must have a heart of stone.)
But Winona Ryder as Spock's mother! Heathers was made 21 years ago? Dear me I feel old.
Myself: I had a similar shock in Trevor Nunn's acclaimed 2004 production of Hamlet at the Old Vic, in which Imogen Stubbs (a slip of a girl as far as I am concerned) played Gertrude.
Prodnose (adopting sarcastic Cambrian lilt): There's posh you are.