Flinch when negotiating to get your way
React quickly to the first offer; whether it’s regarding a new job offer or the cost of a used car, you’re considering purchasing.
This will instantly convey to the other person’s subconscious that you are horrified by the awful offer, which will probably cause them to improve the wage or price offer. Saying something like, “That’s a terrible offer!” won’t have the same impact. To the other person’s conscious mind, that reads as overt criticism, which is likely to provoke a defensive reaction.