This is a chilling, calmly and deliberately delivered speech, by Liam Neeson as Bryan Mills:

https://youtu.be/jZOywn1qArI

I don’t know who you are. I don’t know what you want. If you are looking for ransom, I can tell you I don’t have money. But what I do have are a very particular set of skills, skills I have acquired over a very long career. Skills that make me a nightmare for people like you. If you let my daughter go now, that’ll be the end of it. I will not look for you, I will not pursue you. But if you don’t, I will look for you, I will find you, and I will kill you.

Marko: [after a long pause] Good luck.

Full Article:   https://actingandactors.com/blog/2018/01/16/liam-neesons-speech-in-the-movie-taken/