Why a 'nasty' 10% to 15% sell-off in the stock market may be a few months away

Veteran trader and Thinkorswim founder Tom Sosnoff is a contrarian by nature. And where markets are currently trading has set off a few internal alarm bells. "It's not that I think we're rolling over and crashing or anything like that, but I just think the odds favor the downside in the market," Sosnoff told me on Yahoo Finance's Opening Bid. Sosnoff added, "I think there's a lot of stocks that are very fairly priced, and I know there's not a lot of other things to invest in and things like that. But I ...