The gameplay is quite a bit more in-depth than spinning from target to target and depressing the trigger.

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Up to that point, I'd never really considered the possibility that I might not have the opportunity to pull the trigger at all, for want of a target.

WSJ: Going the Whole Hog at a Hunting School

Indeed, PayPal is now often the target of frustrated eBay sellers who say that the company is too quick to pull the trigger on refunds on behalf of buyers.

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However, the research now means that a common trigger for both shutdown mechanisms has been found - in future, drugs could be designed to target it.

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