Let me clarify on "random" when you meet a total stranger that doesn't know you well you should try to have an interesting convo. When someone knows you then you can sometimes do the random, if you keep switching topics then the other person won't be able to follow your humor or watever and think your crazy. So there's a fine line between being weird and using randomess to create mystery, which can be good. Find someone you look up to and make him your rolemodel then see how he interacts and how the convo is going. You'll slowly learn what makes them so special and good. Check out Marius Panzella (sp) work on how to have a great convo, it's really interesting if you actually use it.