Why seagulls don't want your chips as much as you might think

Have you been to the beach this summer? I took my daughter there the other day and got her a pasty for lunch. She was happily munching it while staring out to sea, back turned to the café where we bought the pasty. Suddenly, there was a flapping of wings behind us and something swooping down. Next thing I knew the pasty was gone, and my daughter was in tears. A seagull had struck and flown off with a free lunch, again.