But even though he would commonly be seen with a goofy face or making a funny gesture, Williams' life wasn't always so funny. The actor often struggled with addiction, and his commentary on the subject reveals a very deep, introspective side to the comedian.
In this interview with the Australian Broadcasting Corporation from 2010, Williams speaks candidly about his own struggles with addiction and his career in stand-up comedy. You can watch the 13-minute interview below.
If you are or know somebody who is having thoughts of suicide, please call the National Suicide Prevention Lifeline at 1-800-273-8255.