There were two tumbling stocks that caught my eyes one year ago: Citigroup and Ford.
Both dipped down to the $1 range. Buying these stocks at that time was risky due to the high levels of uncertainty, the financial meltdown, and the high probabilities of bankruptcy. Additionally, these stocks were in the two worst possible groups at the time: U.S. banks and U.S. car companies.
Nevertheless, if you had some spare cash lying around, buying Citigroup or Ford stock could have been a nice risky bet.
If you bet on Citi, you only made some pocket change given the risk you took. Tripling your money if you bought at the bottom.