Things i don't care about at all are fashion, watching sports (altough i love participating) and loud parties with ear-shattering music constantly playing. I prefer having just a few really good friends in a calm environment.
I can be very serious if the situation or setting demands it, but mostly i am carefree, relaxed and content to joke around, do some silly things for the fun of it or just mess around with whatever catches my attention.
Also i am extremely careful when asking people out, i am highly unlikely to do so unless a large mutual interest is shown.