Victor: I could kill you in your sleep.
MacGyver: I'm an insomniac. You don't want to kill me.
Victor: How can you be sure?
MacGyver: Human nature. I do something nice for you, you do something nice for me - like not kill me. Next thing you know, we're friends. On the off chance I'm wrong, and you get the uncontrollable desire to do something violent, why don't you toss a line in the lake and catch us some lunch.