A man who was spotted wearing his Apple AirPods upside down on public transport has sparked a fierce debate on Twitter.
Technology writer Casey Newton, from San Francisco, spotted the passenger in question on the city's Muni (bus and metro system) and shared a photo on social media at the weekend.

He captioned his tweet: "Absolutely shaken by the way this man on Muni is wearing his AirPods."
The post went viral, attracting more than 26,600 likes and 4,900 retweets - as well as a string of comments.