Fans of the “High School Special” will soon have to look elsewhere for their chicken nugget and potato cone fix, as New Canaan’s Chicken Joe’s will be closing its doors Sunday for the last time. Chicken Joe’s co-owner and New Canaan resident Jay Greco said the Elm Street eatery is closing, primarily, because of prohibitively high rent and tough parking. Greco also said that he donated to and otherwise supported various groups in town and did not always see a return on those investments. “It breaks my heart to close the place because I put my heart and soul into building it but I can’t afford it,” Greco said. “The rent is just killing me.