Poke them with a sharp stick

Another Fine Homemade Parachute Page, Crafted With Love

Or even a dull stick, it'll have the same effect.

Scientists discover how to make squids go completely berserk

A newfound chemical drives male squid berserk, and the molecule appears similar to ones seen in humans, scientists now say.

No kidding. csmonitor.com/Science/2011/0210/Scientists-discover-how-to-make-squids-go-completely-berserk