James Hahn, a Korean-American rookie on the US PGA Tour, has become a YouTube hit ahead of the Pebble Beach National Pro Am after his "Gangnam-style" celebration dance of a Sunday birdie. The 31-year-old born in Seoul fired a final-round 62 to share 16th last week at Phoenix but his birdie dance at the 16th, a grandstand-surrounded hole where rowdy spectators cheer and boo the results of tee shots, stole the show. "I can't believe that I did that," Hahn said. "I was having so much fun.