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It's always intriguing to look at the list of the most heavily-shorted stocks. Many investors like to see which companies are expected to tumble by various short-interest gauges. Owning these stocks long-term can give pause, and perhaps a reason to sell if short sellers' arguments appear to be on the mark. Other investors use the list of the most heavily-shorted stocks to find short candidates themselves. And that's a huge mistake. That's because the most-heavily shorted stocks are often the biggest gainers when major events come to pass. We've seen this phenomenon again in recent days. On Tuesday morning, April 10, distressed grocery chain Supervalu (NYSE: SVU) weighed-in with quarterly results. They were pretty bad, but perhaps not as bad as the most aggressive short-sellers assumed. These short sellers had been holding 73 million shares in short accounts, making this the fourth most-shorted stock on the New York Stock Exchange. That short interest equated to an eye-popping 14 days' worth of trading volume. Simply delivering bad but not horrible earnings led investors to embark on massive short-covering. By the end of trading on Thursday, shares had risen a hefty 23%. Some of that upward spike surely came from short-sellers covering their position by buying back borrowed stock. Roughly 10 million shares traded hands daily going into the quarterly report, though that figure spiked to 38 million on the day results were released. Later that day, Alcoa (NYSE: AA) weighed in with results that were better than analysts had forecasted. As the fifth most heavily-shorted stock on the market, it should come as no surprise that shares quickly zoomed higher and are now up nearly 10% in the last few trading sessions. The key takeaway: it might be wiser to see if heavily-shorted stocks have more upside than the short-sellers might think. If so, those shorts may unwittingly force shares up for you with all of their buying efforts as they cover positions. This is food for thought as we head into the teeth of the earnings season. Here are some of the top targets for short sellers, and the expected dates for them to report results. Risks and rewards...Safeway (NYSE: SWY), another heavily-shorted grocer, also highlights the risk of betting against such stocks. Rumors have swirled that the company may get acquired, and these rumors appear to have little merit. Still, just the rumor has likely spooked short-sellers, and shares are now up for four straight sessions (at the time of this writing). To be sure, some companies appear to deserve to attention of short-sellers. For example, I laid out the long-term threats in place for video-game retailer Gamestop (NYSE: GME) back in October 2011, and though shares are off more than 10% since then (as the broader market has moved steadily upward), recently released sales data imply even worsening quarterly results in the periods ahead. Sales of video games and consoles slid sharply in March, according to NPD Group, and it's getting harder to see how this company can