Comedian JAKE JOHANNSEN once joked that "in New York City, if you find something nobody is holding onto, it belongs to you." If that's the case, then Johannsen may be the property of David Letterman since he's appeared on "The Late Show with David Letterman" an astounding 32 times. With material that covers everything from voting to vegetarian girlfriends, it's no wonder he's a talk-show go-to. His comedy is clean enough to keep the networks happy, but genuinely funny enough to keep audiences rolling. Tonight, Sun., FEB. 18, is the last chance to catch Johannsen at the Funny Farm Comedy Club. $15-$20. Thurs., 8:30 p.m.; Fri. and Sun., 8 p.m.; Sat., 8 and 10:30 p.m. 608 Holcomb Bridge Road, Roswell. 770-817-4242. www.funnyfarmcomedyclub.com.