Ever been turned down for start-up funding? Go ahead then and savor a moment of schaudenfreude courtesy Inside CRM. They've compiled their list of the 20 worst venture capital investments of all time, and it's a veritable wasteland of big dreams and billions in squandered investment. Here are a couple of the biggest debacles. Hey, nobody's perfect.

-Amp'd Mobile: Amp'd Mobile takes the crown for money-burning, with $360 million that ended in bankruptcy. The company's major problem was its customers' ability to pay. Apparently 80,000 of the company's 175,000 customers were unable to pay their bills. Shouldn't it have occurred to someone that this was kind of a big deal?

-Webvan: Webvan was a grocery-delivery business. Once valued at $1.2 billion, the company went bankrupt in 2001. While at one time they'd raised $800 million in venture capital, they ended up with $830 million in losses.

-Optiva: Optiva, a nanotech company that laminated flat-screen TV sets, belly flopped after running out of money. It initially secured, and blew through, $41.5 million. The problem? It took too long to release its product, which was obsolete by the time it came to market. Ouch.