An eagle-eyed plane passenger has caused a stir with a photo taken out the window during take-off that reveals something rather rude.
PlebosaurusRex posted the image with the caption: 'Found something while flying over Denver', to Imgur, where it has been viewed more than 255,000 times.
A handful of users of the photo sharing site were quick to spot that something startling had been carved into the landscape, but others were left scratching their heads