Doonesbury by Garry Trudeau for November 22, 1973
Pilot: Empty Coke bottles, I swear it! I'm very concerned about Cambodia's ecology! Man: Okay, okay! You're free to go. Empty Coke bottles... Heh! Imagine! Voice: It's the real thing! Hee, hee! Are we there yet? Are we there? Man: I see nothing, noooothing!