Doonesbury by Garry Trudeau for April 27, 1971
Transcript:
Mark: Hey, Mike, B.D. told me about your new girlfriend. Mike: Yes, Mark, it would appear I am in love. Mark: In love, eh? That's great, Michael, great! But don't forget, Mike, love is a very fragile thing! You should be very careful with it! Don't abuse it, jar it; love is a very precious quantity! Mike: (I feel like I'm pregnant...)