Doonesbury by Garry Trudeau for August 07, 1974
Slackmeyer: That's right - a heart attack. A pretty bad one, too. Mark: Yeah, Pop, they told me... Slackmeyer: So here you are... Mark: Yup. Here I am... right here with you. Slackmeyer: So how you been? Mark: Okay, Dad, okay... and yourself? Slackmeyer: Not too good. I had a heart attack. Mark: Oh, right, right.