We have some strange superstitions about black cats, walking under ladders, and Friday the 13th... but we aren't they only ones to have irrational fears. These are some of the craziest superstitions that people believe from around the world.
In Finland and some other parts of the world, you really need to decide if you want to kill that spider in your house. The superstition there is that if you kill a spider, it will rain the next day. I say it's worth it!