Doonesbury by Garry Trudeau for July 21, 1982
Transcript:
Plant: Hey, I've got a good one! What did the interior secretary say to the rabbit? Plant 2: Hee, hee! Plant 3: I know that one! Zonker: Okay, that's enough Watt jokes in here! It's way past everyone's bedtime! Plant: "Watt's up, doc?" Plants: Ha, ha! Ha, ha! That's great! Zonker: That's better. Now, I... Plant: Hey, Zonk, how many Watts does it take to turn on a light bulb? Plant 2: Hee, hee!