1.   Mr Morgan and his organ releasing them into hysterical laughter had anaesthetized the horror of the past.

2.   She burst into hysterical laughter.

3.   The big problem for anybody watching the opening ceremony must have been suppressing whoops of hysterical laughter.

4.   The children began shrieking with hysterical laughter.

5.   The sound of hysterical laughter swept through the new arrivals as they looked at each other.

6.   ...hysterical laughter.

7.   ...hysterical laughter which gradually metamorphoses into convulsive sobs.