A man has vented his frustration online after he came across a new bathroom trend on a visit to San Francisco in the US.
Novelist and journalist Tim Maughan said on Saturday during his "first day proper in San Francisco" he needed to use a bathroom at a cafe and was prompted by staff to install an app on his phone.
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Maughan shared an image from the bathroom on Twitter, showing a QR code scanner that unlocked the bathroom door.
"Refused to install app so server printed me out a single use QR code," he said. "How do you people accept living like this."