The common advice to 'never go to bed angry' is flawed. When you feel emotionally out of control, the most sophisticated move is to pause the negotiation. Trying to power through negative emotions is like drunk driving; it's reckless and leads to poor outcomes.

Before anyone commits to a positive decision, their brain must reconcile all the negatives. As Bob Iger did with Steve Jobs, you must first allow the other side to air every grievance and list every con. Only after this mental 'debris' is cleared can they become open to considering the positives of a deal.

Instead of arguing over a valuation number, effective M&A negotiation involves reframing the conversation around the founder's personal risk tolerance. Help them weigh the certainty of an acquisition against the high-risk, "growth-at-all-costs" path demanded by VCs.

To predict the future health of a partnership, intentionally have difficult conversations before any investment is made. If you can't productively disagree or discuss serious problems before you're formally linked, it's highly unlikely you'll be able to do so when the stakes are higher post-investment.

When negotiating with sophisticated investors like VCs or PE firms, founders must be thoroughly prepared. Bill Stone's metaphor emphasizes understanding the investor's perspective, their desire to get a deal done, and having a firm grasp of your own numbers. This deep preparation is the "gun" that levels the playing field, not just legal counsel.

The founders, who admitted to enjoying debate and taking hard-line stances, found their bankers invaluable because they could lower the temperature in heated moments. This personality balance prevented their own aggressive style from potentially imploding the deal.

In M&A, the closer you get to closing, the more emotionally invested you become, even mentally spending the money. This attachment makes founders vulnerable to accepting last-minute unfavorable changes because they've already "emotionally bought in" and moved on from owning the company.

Successful negotiation requires focusing on the ultimate prize. If your counterpart needs to vent and says things you disagree with, let them. Arguing every minor point is counterproductive. Acknowledge their feelings and guide the conversation back to the primary objective of closing the deal.

When investors who previously wrote off your startup try to maximize their return at the team's expense during an acquisition, use a co-founder negotiation tactic. One founder can play the 'bad cop' who is unwilling to concede on team retention terms, shielding the team's financial outcome.