A parent who recognizes an upstairs tantrum is left with one clear response: never negotiate with a terrorist. An upstairs tantrum calls for firm boundaries and a clear discussion about appropriate and inappropriate behavior. A good response in this situation would be to calmly explain, “I understand that you’re excited about the slippers, but I don’t like the way you’re acting. If you don’t stop now, you won’t get the slippers, and I’ll need to cancel your playdate this afternoon, because you’re showing me that you’re not able to handle yourself well.”