Tough nut to crack

“Slumdog” is good, but then “Lagaan” deserved Oscars too, I told a friend.
“Shut up, you peanut,” he reacted.
“No hassle, peanuts are poor man’s cashew nuts,” I replied.
“But a peanut is a peanut by whatever name you call it.”
“Well, do you know that peanut is an ingredient in the making of a dynamite?” I asked him.
“In that case, I will drop the pea, but you are still a nut,” he joked.
“Certain qualities are inborn while some are acquired from friends like you,” I said. “You are a hard nut to crack,” he shot back and we both went to canteen for a hot cup of tea. We ignored the peanuts lying in the tray.