"I love the smell of napalm in the morning" meme typically features an image or series of images where the phrase "I love the smell of napalm in the morning" is altered to replace "napalm" with something else, emphasizing a character or person's enthusiastic or sarcastic liking for the substituted element.
The phrase originated from a line delivered by the character Lieutenant Colonel Bill Kilgore, played by Robert Duvall, in the 1979 film Apocalypse Now. The specific line can be heard in a scene from the film.[1]
Origin: 1979