What, at this point, is a good stock to buy low on?

A stock that has pretty much bottomed out and could pay off in 10-20 years? I'm young (17 years old) and since the market is in the slums and I'm very young, I think it could be a great time to invest in a junk bond/stock or just a stock that can;t drop much further and has room for a mive increase! Thanks!!