Also short selling. Maybe I don't have a full understanding of how it works, but I don't think you should be able to place money down in hopes of the decline of a company. I don't think that really encapsulates the spirit of the word "investment".
Like I thought the whole idea of stock was to put money into companies thag you believe in so they can have extra capital to grow, and then you get a cut of it. How in the world did people figure out a way to bet against companies and profit off of them losing? It just opens the doors for even more insider trading and corporate sabotage.