Doonesbury by Garry Trudeau for July 24, 1972
Transcript:
Phil: I can't believe it! This garbage is an absolute hole! I've tried to be fair with you, Mark! I gave you a decent place to lay your sleeping bag! But you took advantage of me! Mark: Dad... Phil: Sorry, kid, I've had enough from now on, consider yourself completely disowned! Mark: Dad... Phil: Dad? Dad who?