QuickCheck: Will punching a shark in the nose help you escape one?

Sharks have gotten a lot of bad rap over the years (thanks to a particular movie from the 70s). Though attacks are rare, would you be able to fend one off with a quick punch to the snoot?

PETALING JAYA: In the movie Lara Croft Tomb Raider: The Cradle of Life, there is a scene where the titular character, played by Angelina Jolie, punched a shark to avoid getting eaten. Another movie - The Secret Life of Walter Mitty - also depicted its protagonist punching and hitting a shark on the nose with a briefcase during a shark attack.

Will this method save your life if you ever encountered a shark?