1.   He wanted to feel the turbulence, and wound up tumbling through the air like a decompressing balloon.

2.   Normal conversation can be carried on with the top down, although passengers in the rather small rear seat can feel some turbulence.

3.   Some observers see this as a missed opportunity on a grand scale, especially now that the United States is feeling turbulence from slumping foreign economies.

4.   South Korea was the latest to feel the turbulence.