Blazing Saddles 

Gene Wilder was known as a comedy genius, and had incredible talent for humor. He became famous for his creating incredible off-script lines on the spot. This particular line comes from the hit classic comedy Blazing Saddles, which he helped write with friend and fellow comedy giant Mel Brooks. 

When Wilder’s character is trying to console the new Sheriff, he tells him, “You’ve got to remember that these are just simple farmers. These are people of the land. The common clay of the new West. You know … morons.” That last bit was wholly off-script, and he even laughed, but still, it stayed.