Mark Sullivan shows off his plan to create contained hurricanes for electricity production.
They stand out for different reasons. In some, the products are totally infeasible. In others, the entrepreneurs are completely unprepared or so arrogant they don't have a grip on reality.
In anticipation of the seventh season premiere on Sept. 25, we've gathered the Sharks' least favorite presentations as well as our own picks for the worst pitches in the show's history.