Do you get obsessed easy?

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I have a friend that can get obsessed with anything. A couple months ago it was a Disney character. She would buy this character all the time. Now she is obsessed with books. She goes out 2 to 3 times a week and spends 20 to 30 bucks every time on books. She also buys them on ebay and half.com all the time. I don't know how her husband can handle this. Do you know anyone like this? What do they obsess about?