take into one's head

See none of them takes it into his head to run for home.

Well, why should not a dog do as much if he took it into his head?

"And you think she took it into her head to work on this case herself."

He took it into his head to build a house to live in during the summer.

She would never have taken it into her head to hurt him.

You never could tell what they might take it into their heads to do next.

He might take it into his head to go anywhere!

What if the fellow took it into his head to walk around?

But what might happen if he took it into his head to go hunting people!

I just hope Grandfather doesn't take it into his head to do their job as well.