I am scared to death when he is going to start rolling over more (he is rolling both left and right from front to back now), and he is going to roll himself right off the bed or something while I have my back turned for just a couple seconds. That is the way I always hear it happens. "I didn't know he could do that!" "I only looked away for a couple seconds!"
I guess we'll see what happens and not fret about it happening. Any kids that I have heard it happening to have all been just fine. Maybe a goose egg, and the parents feeling like failures, but fine. But wow! He is such a squirmy worm!