VIDEO: This teen doesn't know how to hang up a landline

It's happened.

This video is guaranteed to make you feel old.

14-year-old Layla was asked by her dad to hang up the phone - a landline - in their hotel room and she was completely baffled by the question.

Because she's never encountered one before.

The video has gone viral since being uploaded last week and has divided the internet into two camps - those who remember using landlines (and still do) and those who have been reared on smartphones and cordless handsets.

It's a brave new world.