11.   A wave of nervous laughter swept the ballroom.

12.   Ah, but who knows what lurks behind such nervous laughter?

13.   But it was nervous laughter.

14.   But it was the nervous laughter of fleeting relief that only confirmed the new state of anxious coping now sweeping the land.

15.   But there is also some nervous laughter as well from people who know his best defensive tactic is humor.

16.   Each time, heads bobbed in agreement as nervous laughter rippled through the audience.

17.   Even the lighter moments elicit nervous laughter.

18.   Fear is a palpable part of acrobatics as the nervous laughter among the group attests.

19.   His query drew nervous laughter from the media.

20.   His suit was rumpled, his hands were trembling and his sentences broken by bursts of nervous laughter.