Didn't you have ads in the 20th century?

Leela: "Didn't you have ads in the 20th century?"

Fry: "Well sure, but not in our dreams! Only on tv and radio...and in magazines...and movies. And at ball games, on buses, and milk cartons, and t-shirts, and bananas, and written on the sky. But not in dreams! No sirree."

From Futurama Season 1, Episode 6 (A Fistful of Dollars).