Robyn Millen, an 18-year-old in Brighton, England, was horrified to see a picture her dad meant to send privately to her mother—after he accidentally added it to his Snapchat story.

The mix-up happened since Snapchat allows users to send private pictures to individuals, which expire after a few seconds, but also allows pics to be sent to everyone on a user's friend list via the story feature. Those pictures are viewable for 24 hours. Apparently Mr. Millen was not aware of that distinction, and added a pic to his story instead of sending it directly to his wife.

Sources: The Telegraph | Twitter: Robyn Millen