The 18 worst 'Shark Tank' pitches ever

Hundreds of entrepreneurs have pitched their companies on "Shark Tank" since the show debuted in 2009, but some of the most memorable pitches are the worst ones.

They stand out for different reasons. In some, the products are ridiculous. In others, the entrepreneurs are completely unprepared or so arrogant they appear clueless.

In anticipation of the Season 8 premiere on Friday, we've gathered the Sharks' least favorite presentations as well as our own picks for the worst pitches in the show's history.