Instruct: Classify Amazon reviews into positive or negative sentiment
Query: 4 of 12 Pens Exploded On Me

Watch out for these pens. Perhaps I had a defective batch - 25% of them "broke" in my pocket. I don't do anything rigorous with the pens in my pocket, i.e. jumping jacks, get tackled, go skydiving, so I'm not really sure why I've had such bad luck. I've never had a problem with exploding pens. Back in my day, I gawked at kids in school whose pens exploded on them, not even believing such a thing was possible. I do think these pens write nice and people I come into contact with always try to steal them from me but I wouldn't recommend them for anyone who would be transporting these pens long distances on their person in their pocket. I would recommend getting these pens for someone you don't like very much whose clothes you want to see ruined. If that's what your looking for, these will definitely do the trick.