Kindergarteners at Hickerson Elementary School in Tullahoma learned "Happy Birthday" in sign language.
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Custodian James Anthony got the big surprise when he walked into a classroom.
The school posted the video to its Facebook page.
The school's principal says Anthony is beloved by students, who call him "Mr. James".
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He's worked at the school for 15 years.
A school nurse and a group of teachers taught the children how to sign the song.
Anthony said he was touched by the performance.