Super funny!
I collected loads of these neon spiky balls with Zooplus points (since they often get kicked under the furniture, where the cats can't reach them anymore :'D). The cats love carrying them around, even when playing on their own. But with some cats, you shouldn't just leave them lying around. One of mine always chews and bites on them really hard when she's hungry. Nothing's ever happened, they've always held up, but you should still be careful!