I, for example, can not talk to a girl without discussing the intricacies of the new algorithm I have been dreaming about or discussing the use of alternative fuels in everyday life. Girls also don't seem to take liking to my interests in paleolithic zoology and my scatological humour. Strange, I'd say.
XKCD sometimes mirror what I feel. Here are a couple that I really like :
This I'd love to solve :D