1.   He was a bright-eyed boy, thin and fair, with a vacant expression that often gave way to shrill laughter.

2.   There was a stunned silence, punctured by shrill laughter.

3.   She gave a burst of shrill laughter.

4.   I remember Kumar for his sartorial elegance, his wicked smile and his shrill laughter, which often punctuated one or other scintillating narration about men and matters.