This cult classic starred a young Steve McQueen. He was offered two types of deals. A up front pay check or a percentage of the profits. Not knowing of the success and unaware how well this film would do. He chose the up front money, and passed on the percentage. Yes a mistake but hindsight being 20/20
Steve McQueen received $3000 for his work in the film, and turned down the 10% of the profits. The blob grossed $4,000,000 at the box office. This decision would have paid McQueen in the neighborhood of the $400,000 range.