Mysterious Hand in Photo from 1900s Creeps Out the Internet

A photo has emerged of a group of linen mill girls in Belfast posing for a photo taken in 1900.

This looks pretty ordinary, right?

But take a closer peek, and you'll notice something very strange going on behind the woman at the right end of the third row.

Here's a hint:

A sneaky hand gives a girl's shoulder a squeeze. Photo / Getty Images

The creepy photo was originally supplied to Belfast Live by a reader who said the (probably demonically possessed) woman in the photo was her grandmother.

It doesn't make sense. The hand could only feasibly belong to one of the two women standing behind her, who clearly both have their arms folded.

And it looks way too prominent to just be a trick of the light, or some sort of unattractive deformity springing out of the other woman's arm.

It can't be part of the other woman's sleeve - the lighting doesn't match up, and there are clearly no weird frills on the other sleeve.

What is going on?!