Crust(2003)

Crust is a comedy film following Bill, a washed-up boxer desperate for a second chance. When shady businessman Hamid convinces him that animal boxing could be lucrative, Bill liquidates his savings to purchase a giant mutant mantis shrimp with a devastating right hook. He heads to London with his best friend Steve, an ex-condom-factory worker and amateur boxer, along with Steve's anxious girlfriend Shaz. What unfolds is a chaotic adventure centered on Bill's unlikely dream of making it big with his armor-plated crustacean fighter. As the group navigates the absurd world of man-versus-animal combat, the mantis shrimp proves to be far more intelligent and capable than anyone expected. Crust blends offbeat humor with the underdog spirit of sports films, delivering a wildly unconventional take on redemption and friendship.