An awkward lesson in why you must always always check your photos before uploading them to social media.

Look at this photo.

There’s something not quite right.

At first glance it looks like a naked girl standing behind her friend, while an awkwardly tall man stands behind the said naked girl. (Her buttocks may be brushing against him.)

But first glances can be deceiving.

Look closely.

It’s an ARM, an arm in front of a girl.