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

My husband and I purchased Comfort Zone plug-in to alleviate bad behavior from our aggressive kitten that we recently adopted from the SPCA. It was very expensive and there was absolutely no change in our kitten's aggressive behavior. We plugged it in and a couple of days later, as I was passing the electrical outlet that contained this plug-in, I noticed that it was leaking oil - all over the outlet! I immediately unplugged it and threw it away. Like throwing 40 dollars in the trash. Just glad our home didn't go on fire.