Threw a game with it in practice, tossed it in the front seat (no room left in the bag), started driving home. It was a hot day and so I turned to AC on MAX. I had just been looking at a small quarter inch crack that had appeared under the middle finger about a month ago and thinking to myself that I ought to maybe get the hole drill out and plugged to remove that crack when I hit a pot hole which bounced me, and presumbably the bowling ball, up off my seat. I then heard a loud cracking noise, and having just been looking at that crack in the ball I immediately thought of the bowling ball, and sure enough when I look at it again it has that crack in it.
So, hot day + sun on ball + A/C on max + small crack in finger hole + extreme old age = very large crack.
