Why did the math book look sad?

Because it had too many problems.

Why don't scientists trust atoms?

Because they make up everything!

I went to the doctor and said I had a problem with my ears.

He said, 'Don't worry, it's just a hollow feeling.'

I took my cat to the vet, and they said it was having some vision problems.

I guess you could say it was having a paws-itive correlation between its eyesight and its purr-manent blindness.