Clark has news about a new hip trend in frozen treats that has entrepreneurs going crazy.

Years ago, frozen yogurt was the hottest thing. More recently, it's been Cold Stone Creamery as a franchise opportunity. But Cold Stone has proven to be a big debacle.

The latest "in" thing is tart frozen yogurt. This craze started on the West Coast and is now sweeping the East Coast. The Washington Post reports that people camp out the night before a new tart frozen yogurt store opens up. However, Christa sampled some and didn't enjoy it.

So here's a special warning to entrepreneurs about jumping into the latest "can't lose" opportunity. While early adoptees may profit, the second and third waves of people who get on board often wind up losing money. Just because it's hot, that doesn't mean it's an automatic money maker. It might just burn a hole in your pocket.