Doonesbury by Garry Trudeau for July 27, 1972
Transcript:
Mike: Mark! How are you, ol' buddy?...What?...No, no, I haven't been able to get a summer job yet...a motorcycle trip?...Hey, yeah, that would be terrific! I can hitch up my old sidecar to your bike!...yeah!...But Mark, tell me why are you so fired up about leaving home? Mark: Oh, I've got my reasons.
Get ready for Joanie down this particular road.