#23: Raining Cats and Dogs
These next ones made me laugh a lot. If you think about it, it actually seems really reasonable to think that the moon is the back of the sun. They appear roughly the same size in the sky, even though, in reality, the sun is significantly larger than the moon. And you rarely see them both at the same time.

There’s no excuse for the second one, though, other than the age of the poster at the time. This is super hilarious, but it makes me feel a little bit bad for the cat. Imagine growing up thinking that you’re a great cat because your owner takes good care of you, and then you find out that he’s only nice to you because he’s hoping you’ll turn into a dog. Where did they get that idea?!