Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Dangerous

I've had two GoFit yoga balls in a row and both have exploded after moderate use. The first time, the bottom ruptured on a seam but the ball deflated slowly so I had time to prevent a fall. The second time, I was just sitting on the ball in lotus position when the entire ball came apart under me and caused a painful fall.For the record, I'm 5'11" and 195 pounds.