Sorry, that was silly. I do have some real proof, though. Just open your mind and guess which photo is going to appear below.
a) a duck
b) a tree
c) a car, or
d) a double-yolked egg I cracked open last week that looks just like a butt?
Once you think you've got the answer, scroll down.
Ta da! IT'S THE DUCK!
I rest my case.