Other obsessions involve cleanliness and a need for order, where people continually wash their hands, clean the house, experience a fear of contamination, and perform tasks or place items in particular places or patterns. (psychlopaedia.org)
I have a little obsession (among many other obsessions) with coin purses. (flamingotoes.com)
He'll reappear tomorrow, yipping like a Pomeranian on steroids about some other obsession of his — subjective / objective morality, perhaps. (religion.blogs.cnn.com)