I'm in over my head with this project.

I scratch my head when I'm confused.

He always hits the nail on the head with his comments.

She fell head over heels for him.

He is always woolly-headed and can never focus on anything.

I just wanted to give you a quick heads-up that the meeting has been rescheduled from Thursday to Friday.

Some people have their heads in the sand when it comes to climate change.

They often butt heads with each other over whose idea is better.

He walked into the room with his shock-headed hair.

She is often described as empty-headed.