I'm that friend who brings up the interesting stuff. Never really had a friend like that, to be honest. Sometimes I ask my friends a strange question or tell them something completely pointless but interesting and then wonder how it would be if someone had said that to me instead.
Bleh, my enjoyment is split between talking with friends and talking with strangers. With friends I pretty much know what I'm getting from a conversation with them, but strangers have the potential to bring something new.