Last Sunday while hunting for some cool figures in Akiba I discovered a fetish shop devoted to almost any kind of fetish. Among the most interesting DVDs is Crush by Venus, produced by Gagon. It's a DVD series dedicated to model train crush fetishists.
Seems that the "crush fetish" started in USA. Women would crush insects or worms with their feet, or high heeled shoes, but Japanese switched to otaku products like Model Trains or Die Cast cars.