So, have you ever heard of H&H Imports, Inc?
No? Well, you must not be one of the 3.8 million Twitter followers of rapper 50 Cent, who seems to have indulged himself in a little market manipulation last weekend. His tweets included statements like "You can double your money right now. Just get what you can afford". A few others have been archived on Thisis50.com.
But don't take my word for it. Here's the chart for HNHI:
Pretty much $0.05/share until January 10, the first trading day after the tweets went out. That day, HNHI opened at $0.45 and closed at $0.39, with a volume of 8.9 million shares (about 10 times greater than normal).
For what it's worth, it doesn't appear that Curtis Jackson III was indulging in a "pump & dump" scheme, mostly because he owns 30 million shares (12.9%) of the company and there are no SEC filings indicating that he attempted to sell during that time. On the other hand, he's got a massive stack of warrants that are really only valuable to him if HNHI manages to get its stock price above - get this - $0.50 per share.
What's the world coming to, when you can't trust a rapper to give you useful investment advice?
 For purposes of this article, "little" is defined as an estimated $8.7 million.
 There were others. They have been deleted.
 That's 50 Cent's real name.