Our multi-millionaire Dragons may think they're shrewd enough to spot a lucrative business opportunity when it's pitched right in front of their eyes, but they don't always get it right and, every so often, the rejects get the last laugh.

These are the Top 3 Dragons' Den rejects that went on to make millions:

00:01 - #1 Martin Wadsworth, managing director of DiscreteHeat is in the Den seeking £150,000 in return for a 10% equity stake.

13:29 - #2 Natalie Ellis is pitching 'The Road Refresher' - a non-spill dog bowl. She's seeking £120,000 for 15%.

23:55 - #3 Shane Lake & Tony Charles are pitching 'Hungryhouse' - a website for local take-aways. They're seeking an investment of £100,000 for 11%.

An international sensation, Dragon's Den features entrepreneurs pitching for investment in the Den from our Dragons, five venture capitalists willing to invest their own money in exchange for equity.

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