Some contestants were rejected by the Sharks, but have still gone on to make a fortune. For example, Mile Kane and David Artuso – the masterminds behind cellphone case company Cellhelmet – failed to secure a $160,000 investment for 20% of their business when they appeared on the show in March 2013, with Kevin O'Leary telling them to “get on the boat, and float away”.

Speaking of tough love, Kevin O'Leary is one of many multimillionaires who make sure their children have a strong work ethic... read about how the Super-rich refuse to spoil their kids

American Shark Tank success stories that made millions