Doonesbury by Garry Trudeau for December 13, 1992
Transcript:
Sam: Here it comes...here it comes! Bingo! Ray: What's happenin', Z-man? Zonker: Raymond! Cool to see you! Ray: What's up with the hat? Zonker: The hat? It's protection from the sun, son! Ray: No, I mean the "X". Zonker: Oh, that. I dunno, I saw it on the street, and I just took to it, had to have one. Ray: Why? Zonker: It's who I am. I identify with it. Least, half of me does. Ray: Yo, Zonk - you know what "X" stands for? Zonker: Um..sure. The famous sex chromosome, right? Ray: Zonker! There's a child present!
Nowadays, it stands for Elon Musk.