Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Dangerously fragile

I bought these classes earlier today because they are attractive and inexpensive. I placed them in the dishwasher to clean them all prior to use, and one was cracked and a small fragment of glass had broken away after the cycle was done. I then checked Amazon's reviews, and found that this was a common experience. They're going back to the store tomorrow.