For those of us using fingerprint authentication....

A Qatar Airways flight had to make an emergency landing after a female passenger found out her husband was cheating on her mid-flight, reports the Hindustan Times.

The unidentified Iranian woman reportedly used her husband’s fingerprint to unlock his phone while he was asleep, before becoming incensed by what she found on the device.
Source: Flight diverted after woman discovers her husband is cheating on her

Ironically I was just thinking about this (someone using your finger to unlock a device) and here we go