Foot fetishes...

As a tribute to a dear friend of mine who hates feet all together (Hi Steph!) I'd like to share my hate of foot fetishes. I once knew a girl who had an incredibly grotesque foot fetish. In a game of truth or dare she only picked foot related dares. For example, she wanted me to kiss someones foot, and she wanted another girl to massage someones feet. We all refused to play into her twisted game and went swimming instead.
I just don't understand foot fetishes. Why? When you have so many weird fetishes to pick from, why would you go with feet? Feet can be nasty, crusty, dirty, smelly, hairy, misshapen, and a number of other unpleasant things. How does someone become obsessed with feet anyway? Are they born with the obsession or does it come about one day when they realize feet are everywhere? I don't know...foot fetishes are just plain weird.