There are obviously way more than the select few that I have here, but these are the ones that amused me today.
Perfectly parallel lines.
Can you see the man?
Coming or Going?
This place actually exists, apparently, at 39 Avenue George V in Paris.
And, this is my personal favourite. It is an optical illusion that shows a president where one does not really exist (it really is a photo of an empty chair and a microphone).