come to a head

as they come

As it is possible to be.

bang one's head against a brick wall

To waste effort on a futile project.

bash someone's head

To beat up someone violently.

big head

An inflated ego, an exaggerated belief in one's own importance.

bite someone's head off

To severely berate someone.

blow someone's head off

To shoot someone in the head.

blow to kingdom come

To totally destroy (something); to annihilate or wipe out (something).

bury one's head in the sand

To deliberately ignore the reality of a situation; to pretend a problem does not exist.