I went to buy tender coconut, also known as nariyal paani.

Me: "Bhaiya, 5 nariyal paani dena."

Shopkeeper: "4 dunga."

Me: "Bhai, 5 chahiye, 4 nahi."

Shopkeeper: "Bhaiya, ai 4 he dunga."

Me: "Arre, itne saare sajaane k liye hai kya... 5 chahiye. Pagal wagal ho kya."

Shopkeeper: "Kahin aur se le lo jo 5 de raha ho.... mai to 5 he dunga."

At this point, I was almost ready to walk away. But just then, I noticed a board hanging at his shop: 100 Rs. Mein 4 Nariyal Paani. He was tired of constant heckling and was not on drugs, btw. 

Me: "Bhaiya, 125 me 5 de doge."

Shopkeeper: "Arre, 4 he dunga... hain!!!! haan 125 k 5 dunga na sahab..."

And just like that, a negotiation that seemed destined to fail was successfully concluded. All it took was a little change in perspective.