Why was the math book sad?

Because it had too many problems.

What do you call a fake noodle?

An impasta!

I'm a baker, and I'm feeling crumby about my career choices.

So I was at the beach with my kids, and we saw a person building an enormous sandcastle with towers and a moat. The kids were fascinated by the details and started asking the builder about their design process. I asked the person how they managed to make their castle so sturdy, and they said

it was a grain of experience