Calvin and Hobbes by Bill Watterson for June 13, 1990
Doctor: Yep, that's chicken pox all right. Calvin: Chicken pox?! Mom, what is this guy? A veterinarian?! Doctor: The virus should run its course in about a week. Calvin: He's mad! Mad, I say! I'll bet the real doctor is tied up and gagged in the other exam room! Doctor: He's extremely contagious, so keep him away from other kids. Calvin: Sue him, mom! Drive his malpractice insurance up! Mom: Calvin has to be inside for a week?? Doctor: That's a nasty twitch you've developed. Calvin: Hey doc, for 10 bucks I'll make sure you see those kids in the waiting room again real soon!