Jarmusch, who has cast Pop in his movies DEAD MAN and Coffee and Cigarettes, has the wildman singer to thank for helping him realise how film folk take advantage of his good nature.
Jarmusch tells British magazine Empire, "I've become a little less accessible to people who want stuff from me that's not helping what I'm supposed to do.
"Iggy Pop taught me what we call 'Brat Theory': if you're difficult with people to protect yourself, they'll respect that. If you're very open and do whatever they want, they'll walk right over you. So you have to be a brat. Iggy's very good at that."