Circumstances are not entirely clear, and I do not want to speculate too much here, but sounds like a lesson for others that routinely fly VFR in/near Class B airspace.
Pilot requests permission from Houston Center to climb on top to 9,000, is assigned 9,500. He then requests to file a flight plan because "conditions weren't what they were". He goes on to say he is "out" and can make a turn on course. The remaining audio tells the rest of the story.
Hate to single a pilot out, but, in a lifetime, a pilot will not make every mistake possible and these situations provide lessons to others.
Audio edited with only a few missing comms due to other frequency coverage. Heard on KHOU.