iPad data entry errors caused plane to strike runway during takeoff

What's a fat-fingered ten tonnes between friends in a QANTAS Boeing 737?

On the 1st of August, 2014, cabin crew aboard a 737 operated by Australian airline QANTAS reported hearing a "squeak" during takeoff. The crew's ears were good: the sound they heard was the plane's tail scraping the ground - a "tailstrike" - during takeoff."