For those of you who worry about the pain and suffering a lobster endures while being cooked, there is the Crustastun, which the company of the same name says is the world's first humane way to kill lobsters--before you eat them!
"The application of a stun (110 Volts, 2-5 amps) causes an immediate interruption in the functioning of the nervous system of the shellfish," according to Crustastun's site.
The single stunner kills lobsters and crayfish in about 5 seconds, though crabs can take twice as long. (I always knew crabs were tougher.)
The "continuous flow" stunner lets you engage in humane execution in a speedy, more economical manner.