Agreed. For me, it's the asinine negotiation tactics that both the buyer and seller go through in order to get what they want ("let me go talk to my manager", getting up and sitting back down in your chair, sob stories about losing money, etc.).
Yeah, that whole "let me go talk to my manager" thing is soooo annoying. I got really pissed off when a dealership did that with me. I told them my offer was firm, and every time they came back with something closer, but never there. I finally just walked out after yelling at them (got other customers to stop what they were doing and look at me) for wasting my time and not being serious about selling cars, and went to another dealership. I gave that dealership an offer below their asking price, and the guy literally said "here, let me just take some more off of that and we'll call it a deal". Sure, they may have significantly marked it up before that, but that was very refreshing. We got the car we wanted with no hassle and paid what we thought was a reasonable price. The only thing that upsets me is that the crappy dealership is the closest one to our house, so when we need service/diagnostics, they end up getting our business. Granted, the service department and sales departments are run by different people, but it leaves a bit of a bad taste in my mouth.
I'm half tempted (if I ever buy a non-Tesla) to tell them I'd like to play a game. One time offer, they accept it or I walk away. The rules are simple. I put down the highest price I'm willing to pay on a piece of paper that they cannot see. They put down the lowest price they're willing to sell to me, also on a paper I can't see. Then we swap papers. If their price is lower than my price, we split the difference in the middle. Both should be happy -- I paid less than I was willing, and they got more than they were willing to let it go for. If there is no overlap, then I walk away. No games. No second chances.
If they beg and plead to try it again, and if I still want the car, I'll tell them "fine, but my max price just went down significantly to penalize you for your games".
I have no idea if they'd be willing to play such a game, but it sure would beat the hassle of the back-and-forth with "manager", or doing the other trick of going to lots of dealers and getting price quotes, then take the lowest two and pit them back and forth to get the lowest offer. I'd really like to just walk in, look at a few cars, decide on which one I want, and settle on a price within a couple minutes.