Oh, and ten minutes later, I sold the bike to someone else. And the original customer was still there.

BTW...I teach negotiating. I thoroughly enjoy it when someone comes in and wants to "bargain and compromise" (which is not negotiating...not even close) and they figure that they are the last person on earth that will ever come into the shop and buy a bike or we'll go out of business.
Problem is that they don't realize that, while we'd like to sell them a bike, we don't have to sell them a bike. We'll try to sell them a bike. But it might not work out for both of us.

The vast majority of people fail to grasp that point.