He nailed a nail into the wood.

Kugimiya is my best friend.

Kugitani is my best friend.

Preaching to him is like casting pearls before swine.

He drove the nailhead with a hammer.

This holy nail is carefully stored as a treasure of the church.

He made a comment that put a damper on my plans.

He always acts conspicuously, so the proverb 'The nail that sticks out gets hammered down' fits him perfectly.

He tried to save a little only to lose a lot, like picking up nails from the ruins.