[James hesitates to think that his definition of fun is the same as Jilly's. So he tries to think of something normal by...normal people's standards.]

I used to like... [No. That wouldn't work.]

Well... [Nope. Not that either.]

I used to study astro-physics in university. [He says it as bashfully as possible.]

Because of that I spent a lot of time star-gazing...sort of became a pastime after school.