Nathan James Barnatt (born February 2, 1981) is an American actor, comedian, dancer, YouTuber, stuntman and filmmaker.

In 2012, Barnatt developed a show with Adult Swim based on his Keith Apicary character called Youth Large.

Since then, Barnatt has sold shows to television networks Nickelodeon, Amazon, Comedy Central, Fox and Viceland.

On December 20, 2016, he again appeared as his character Keith Apicary in a Christmas episode of the Angry Video Game Nerd episode where he dresses up as Will Ferrell's character from Elf in order to secure Santa's gifts, and he and the Nerd play a variety of games with different Sega Genesis accessories while destroying the set in a slapstick fashion.

Deliberately edited to look and sound like a 1990s commercial, the customer talks about all the features of Sonic Mania Plus and its low price while Barnatt repeatedly tries to sell Finger GunZ with comments taking direct jabs at the games industry.

[16] The series was a surprising success for Barnatt, who was experiencing financial struggles severe enough that he prepared to live in his van.

[2] In June 2021, Barnatt appeared on season 16 of America's Got Talent as his character Keith Apicary where he received four "yes" votes from the judges for his dance routine.