There Will Be Blood (2007)
“It’s one of my favorite endings ever! The main characters are both horrible people, who we see interacting in the movie over the course of many years/most of their lives. One becomes a merciless, vindictive oil baron and the other becomes a smarmy, hypocritical radio evangelist. The ending consists of the evangelist going to the baron to beg for money to support his fraudulent lifestyle, where the baron drunkenly mocks and belittles him, then beats him to death with a bowling pin.”
-keplar