They're Nuts! follows the activities of the Nutville Internal Medicine clinic and their patients. This comic primarily focuses on diabetes and health care humor. It also has a nice twist of randomness to keep it interesting.
Sometimes I think people use this excuse just to get out of actually making their appointments. They justify it by thinking, "Oh, I called, so I made the effort." Either that or there are just a ton of people out there who don't think before they call.