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If you're sick and tired of receiving unsolicited telemarketing calls, then Californian Roger Anderson may have invented the perfect remedy. His "Jolly Roger Bot" is an automated response system that keeps cold callers on the line, but ends up leaving them feeling confused and frustrated. Here is a demonstration of how it works, followed by a chat with Anderson himself. (Photo: Operators in a call centre. Credit: Findlay Kember/AFP/Getty Images)