The old adage that timing is everything certainly rings true for these photographs.

A collection of images that were inadvertently taken at a perfectly opportune moment have been shared by Go Social - and they'll leave you doing a double take.

All of the photos feature an accidental optical illusion effect that will mess with your mind, and force you to take a closer look to see what's really going on.   

From a giraffe that appears to have two heads to a woman with an extra leg, these pictures might leave you stumped.

This article was first published on Daily Mail and is republished here with permission.