I have 3. And don't usually wear any of them. Somehow I convinced myself, on 3 occasions, that a less weird looking, or more comfortable, or bargain priced in the case of the Kask, would somehow encourage me to wear one. It didn't. It just reinforced my long held beliefs on helmet wearing, which can be found in the appropriate section of this forum. A place for which this thread is destined.
Edit... Make that 4. Forgot about the one that was thrown in as a sweetener with the purchase of a new bike many years ago.