While shooting There Will Be Blood, DDL made the first actor playing his son quit because he treated him like shyt on and off screen
He got pneumonia after refusing to EVER wear anything inauthentic to the era while shooting Gangs Of New York.
I think he lived in a log cabin and shyt while shooting Lincoln, too.
Dude is a psycho.
The GOAT
I just read that he killed everything he ate for several months while prepping for Last Of The Mohicans