depends on how the philosophy thing pans out... like if it's just off the top of your head freestyle philosophy (think stoner talk) I'd be all over it. But if your like quoting Nietzsche or whatever like some damn fool it would get old quick and lead to much
... actually I'd probably just tune it out or redirect it into something else if you were doing that. Probably tease you about it afterwards or turn it into sexual inuendo.
As far as intellectual topics go... I like the random "hey listen to this cool shit right here!" sort of stuff (I do that alot myself with my friends). It's all about being a catalyst for more "stoner vision" sort of thinking though. Like "how can we use this to make our own army of monkey assasains to take over the world with?"