Source: The Princess Bride. Speaker: Inigo Montoya. It's also a line from the original book by William Goldman.

Where you've heard it
Related Content
My name is Inigo Montoya. You killed my father. Prepare to die. Domingo remained obscure because he disliked dealing with the stupid rich and privileged. When Count Tyrone Rugen , a nobleman with a six-fingered right hand, asked him to forge a sword to accommodate his unusual grip, Domingo poured his heart and soul into the project for a year until it was done. When Rugen returned, he reneged on his promised price, willing to pay at only one-tenth. Thus, Domingo refused to sell him the sword, not as a matter of money, but because Count Rugen could not appreciate the great work of the sword. He proclaimed that the sword would now belong to Inigo.
Related words
You killed my father. Prepare to die. When Rugen returned, he was only willing to pay one-tenth of the price one-fiftieth in the novel he had promised.
In Rob Reiner 's film adaptation , he was portrayed by Mandy Patinkin. Inigo's father Domingo was a great swordcrafter , but he remained obscure because he disliked dealing with the stupid rich and privileged. When Count Rugen, a nobleman with a six-fingered right hand, asked him to forge a sword to accommodate his unusual grip, Domingo labored over the sword for a year. When Rugen returned, he would not pay his promised price. Thus, Domingo refused to sell him the sword, not as a matter of money, but because Count Rugen could not appreciate the great work of the sword. He proclaimed that the sword would now belong to Inigo. Rugen then promptly killed Domingo.