REUTERS/Molly Riley Lance Letson Hungar of McLean, Virginia, waits for his turn during the semi-final round of the 2008 Scripps National Spelling Bee in Washington May 30, 2008. 
In a rare tie last year, Texas teenager Ansun Sujoe gave up on trying to pronounce the winning word, just saying "whatever" and proceeding to spell it.
That word was feuilleton, a section of a European periodical designated for gossip and other topics that would appeal to the general reader (sort of like the New York Times' style section).
The other winning word, stichomythia, means a dispute delivered by actors in alternating lines, like in classical Greek drama.
The winning words weren't always this arcane or difficult to spell. In 1932, for example, the winning word was knack. The word interning won in 1936, and therapy took the prize four years later. Since the 1950s, though, the Bee has featured words like cymotrichous that might have educated people scratching their heads.
We looked back at some of the biggest head-scratchers that won the Bee:
2011: cymotrichous (adj.) - having wavy hair
Spelled by Sukanya Roy.
2009: Laodician (adj.) - lukewarm or indifferent in religion or politics
Spelled by Kavya Shivashankar. Reuters/Kevin Lamarque Co-winner Ansun Sujoe of Fort Worth, Texas spells a word during the 87th annual Scripps National Spelling Bee at National Harbor, Maryland May 29, 2014.
2004: autochthonous (adj.) - formed or originating in the place where found, native
Spelled by David Tidmarsh.
2002: prospicience (noun) - the act of looking forward, foresight
Spelled by Pratyush Buddiga.
1999: logorrhea (adj.) - excessive and often incoherent talkativeness or wordiness
Spelled by Nupur Lala.
1997: euonym (noun) - a name well suited to the person, place, or thing named
Spelled by Rebecca Sealfon.
1996: vivisepulture (noun) - the act or practice of burying alive
Spelled by Wendy Guey.
1986: odontalgia (noun) - toothache
Spelled by Jon Pennington.
1980: elucubrate (verb) - to solve, write or compose by working studiously at night.
Spelled by Jacques Bailly.
REUTERS/Jason Reed Evan O'Dorney and his mother Jennifer laugh after he won the 2007 Scripps National Spelling Bee trophy in Washington May 31, 2007.
Spelled by Nettie Crawford and Michael Day.
1961: smaragdine (adj.) - Of or relating to emeralds, having the color of emeralds.
Spelled by John Capehart.
1960: eudaemonic (adj.) - producing happiness, based on the idea of happiness as the proper end of conduct
Spelled by Henry Feldman.
Walter Hickey wrote the original version of this post.