A bug has made Amazon.com's Echo home speakers to make laughing noises at random - actually it's like Alexa - the bui't-in digital assistant - to laugh at you - and Amazon promised to soon fix it.

Alexa has been programmed to laugh if specifically asked to do so. But according to reports, the strange laughing noises were random or in response to unrelated commands.

An Amazon representative confirmed the problem and said the Seattle-based company is working on a remedy.

Amazon can push updates to the voice service automatically.