It's hard to put a monetary value on life-changing advice. But in Samuel L. Jackson's case, the figure clocks in right around $12.8 billion. That's how much the dozen Marvel films in which his character Nick Fury appears have grossed at the box office since he first donned the iconic eyepatch in 2008's "Iron Man."

Bruce Willis gave Samuel L. Jackson billion-dollar advice while filming "Die Hard With a Vengeance" in 1994. Willis told Jackson to be like Arnold Schwarzenegger and Sylvester Stallone.