She uttered a disbelieving laugh.

Kate gave a disbelieving laugh.

He glanced at the building, and gave a disbelieving laugh.

At first, there was a moment of hushed astonishment, a few disbelieving laughs, and a general aura of shock.

A disbelieving laugh escaped her.

She gave a disbelieving laugh.

He gave a disbelieving laugh.

Kira blurted a disbelieving laugh without having meant to.

The doctor gave a disbelieving laugh.

Spock didn't react as Kirk beamed at him, then gave a disbelieving laugh.