Eggcorn Forum

He hits me in the arm and signals to the gigantic plastic bag in the back seat.
“They gave me a pork.”
“What?”
“Buy one get one free,” he smiles.
“What does that have to do with pork?”
He hits me again. “You don’t know? Haha,” he says, his wide denture-less smile showing off the gaps in his mouth.
I resign. “Please tell me.”
“Pork — it means something extra, like the fat of the pig.”
“You mean perk.”
“Yes. Pork.”
“Perk.”
“Same thing.”
“No — these are two very different and distinct words. You want to say perk.”
“Pork. Like the extra fat. Everyone likes a pork in life.”
I give up. “Okay, pork.”

Source: http://bygonebureau.com/2010/10/15/root-words/