WATCH: Spelling bee contestant goes from ‘I totally know it!’ to ‘What!?’

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OXON HILL, Md. — Jacob Williamson captured h-e-a-r-t-s at the National Spelling Bee finals.

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.