Ramu's dog, Barkie, strayed into his neighbour's garden and accidentally knocked into and broke a vase valued at RM2,000. The angry neighbour detained Barkie in his compound. He refused to return Barkie to Ramu unless Ramu paid him RM15,000. Ramu was anxious about Barkie's safety and promptly paid the neighbour that amount. Barkie was then returned to Ramu unharmed. Ramu is now unhappy about having made the payment and wishes to know whether there are any grounds under the law of contract on which he could recover the amount of RM15,000 from the neighbour. Advise Ramu.