There are entire groups of people who absolutely love their trains, and can even tell you everything about the different types and networks. Trainspotting is a hobby that involves individuals writing down the numbers of a passing train.

Navel Fluff Collecting

Every single person on this planet has spent time picking at the lint and fluff that forms inside of your belly button. There is nothing wrong with that whatsoever. However, what is even more odd is the fact that people actually collect the stuff in jars.