During adolescence, in the middle of dozens of arguments with parents, children always look for a trump card. They haven’t usually been taught (or have yet learned) that “proper” arguing is not an attempt to hurt someone or even to gain power over someone. So they look for phrases they can use to wound. I believe the current and historical leader is “I hate you!”
However, I’m adopted, and we have a thermonuclear weapon-style trump card in these battles. Adopted children can tell their parents that “you can’t tell me what to do, you’re not my real parents.” It’s a tactic/ploy that only possibly works once – but it’s quite effective at the time (if relationship damage is the goal).
If/when you work for a large organization and you’re in the middle of a negotiation, every once and awhile, you’re also tempted to whip out a trump card. A phrase you can say which will simply put the other side “in their place” and remind them who is in charge of the deal.
For large organizations, that phrase is “We’re an $xxM/B company. You can either accept my suggestion or I can turn to one of the hundred other customers/suppliers waiting to talk with me.”
I’ll admit it… I used the phrase once. And yes, I got my way. But ultimately, I hurt the relationship and the lesson I learned was the business version of the personal lesson from childhood. Hurting the other side, thus hurting the relationship, is never the goal of an argument or a negotiation. The goal should be to work together to successfully meet the needs of both sides and solve the (business) problem. If the only way you can get your needs met is to use puffery, then perhaps the deal was not meant to be… and you should walk away.
Oh… and if you’re going to use this verbal weapon, you might also want to make sure you really have the relative size compared to your opponent. Sony is currently learning this.