You've alle heard of the 'Face on Mars,' the 'Mother Teresa Cinnamon,' or the 'Twin Towers Demon.' Things that look like other things are often referred to as pareidolia.
A vague stimulus from an image or sound is being perceived as significant. A slight pattern in an object is perceived in our brain and linked to something we know in real life, such as a face or a religious symbol.
Here's a list of the top 20 things that look like things.