So I was cleaning a Better Bottle yesterdsy and I was rolling it on its side and it cracked!!! I could not believe my eyes I was not doing anything that I have not done before or on other Better Bottles!!

Important Note: Never rock or swirl Better-Bottle carboys without using a tennis ball. Doing so will cause the edges of the bottom of the carboy to flex under great stress repeatedly and eventually cause cracks, like bending a paper clip back and forth.
Two modes of failure for Better Bottles are flex cracks (by rocking a full bottle back and forth on the bottom rim) and caustic stress cracks (by pouring in PBW and other strong alkaline cleaners in powder form before the water).