A social media trend has been promoted by Swiss app Castl, which launched its bizarre Cow Kiss Challenge to raise money for charity. But politicians and farming officials say that it's creating a nuisance and could lead to people getting trampled to death by upset cows, particularly those with calves. Castl has been encouraging people in Switzerland, Germany and Austria to kiss cows for a good cause since launching its “KuhKussChallenge” on Wednesday, "with or without tongues".
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