1.   Floors were buckling.

2.   The floor buckled, and the front end of the car was a mess of splintered wood and twisted metal.

3.   The top floors buckled out, spraying tiny white shards, and the building sank down into itself, crouching beneath the trees and out of frame.

4.   Then, with little warning, the main floor buckled inside the warehouse.

5.   There was also no rear fire exit, and the new vinyl floors were buckling.

6.   Two new classrooms, salons for prospective hairstylists, have already been closed because the vinyl floors buckled so badly that the hair dryers were tipping over.

7.   Suddenly, without warning, the floor buckled underneath them and the dancers disappeared, plunging three stories.

8.   Suddenly, the floor buckled underneath them and the dancers disappeared, plunging three stories into a heap of rubble that billowed gray smoke and sparks.