Doonesbury by Garry Trudeau for January 17, 1974
Transcript:
Man: I phoned up ahead and told the guys I'd met a professional protester. They went bananas! Everyone agrees you're just what we need to get our protest organized. Mark: Good. Good. I wired home for my equipment. Man: Your what? Mike: "Please get gas mask and arm band from attic and send immediately. Stop. The revolution lives."
I especially love the last line.