(CNN) -- Jacob Williamson captured our h-e-a-r-t-s at the Scripps National Spelling Bee finals this week in Maryland. The 15-year-old was confident, enthusiastic and wore his emotions on his sleeve -- the perfect ingredients for a viral video. "I know it! I know it! I totally know it!" he said when he was given the word "kabaragoya" (a large lizard native to Asia). His excitement made viewers smile -- and then cringe when he misspelled the word with a C instead of a K. His reaction to learning his mistake was a stunned, "What!?" The video of his final mistake has made Williamson an Internet sensation. One website even set his ordeal to rap music. 1986 spelling bee winner: National contest isn't bee-all and end-all . What to know about the spelling bee . The agony and ecstasy of the National Spelling Bee .
Jacob Williamson captured hearts with his enthusiastic performance . Williamson said, "I totally know it," before misspelling final word . Video has become Internet sensation .