If you've seen HBO's cult comedy series "Flight of the Conchords," you've probably seen comedian ARJ BARKER, although his face might take a minute to register. He plays Dave, an American buddy of New Zealand musicians Jemaine Clement and Bret McKenzie, and his self-styled reputation as a ladies' man suffers from the fact that he lives with his parents. Barker also co-stars in a Flash animated series about his flatulent cat called "Arj and Poopy," but as a solo act he brings his observational humor to the Funny Farm for one last night Sun., AUG. 3. July 31-Aug. 3. 21 and up. $15-$20. Thurs.-Sun., 8 p.m.; Fri.-Sat., 10:30 p.m. 608 Holcomb Bridge Road, Roswell. 770-817-4242. www.funnyfarmcomedyclub.com.