I was once asked that question at a party. I was considering how to answer it: Does a bare frame count? If I have all the parts but they aren't assembled should that count? Then my wife jumped in "He has 8 bicycles." As we were standing there I wondered which ones she didn't know about.
My main rides today are the Rans short wheelbase recumbent in my avatar and my Marin beater bike. I also own a Hase tricycle that I can hitch to Mrs. Grouch's as a tandem, a recently rebuilt but so far unriden Porsche mountain bike, a Bridgestone road bike and a Raleigh fixed gear bike. None are factory original and I basically ride as an excuse for creating and modifying more bikes. Which one I might ride on a given day depends on my whim and who I plan to ride with.
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My greatest fear is all of my kids standing around my coffin and talking about "how sensible" dad was.