21.   Is it a nervous laughter?

22.   Nervous laughter?

23.   Nervous laughter is also built in, and jumpy viewers can use every bit of it.

24.   Nervous laughter.

25.   Nervous laughter rippled forward as Thompson rushed to keep his counsel within the bounds of political correctness.

26.   Our nervous laughter betrayed the fact that we were ill at ease in this political world.

27.   Scattered applause, some nervous laughter.

28.   She offered nervous laughter.

29.   Sure enough, as the warm-ups continued, nervous laughter turned gleeful.

30.   The article describes family members bursting into nervous laughter.