A Brooklyn substitute teacher is being investigated after telling the truth about Santa to a group of five year olds.
And parents are furious.
"People are mad. That's not his decision to make," one dad told The New York Post.
Another told the publication that the substitute has a history of odd behaviour.
"There were warning signs. My daughter had him last year. He's said some inappropriate things. He had weird nicknames for the kids, to remember their names."
And the truth bombs didn't stop with Father Christmas - the poor Tooth Fairy was also outed during the lesson on "the power of persuation."
In a letter to parents, Principal Liz Phillips said she was "extremely upset" that the teacher told the kids that Santa and the Tooth Fairy don't exist.
"This discussion was completely inappropriate to have in school with first graders," she wrote. "It was a terrible lapse of judgment on his part, and it never should have happened. I guarantee you that this substitute will not be in class 1-216 again. In terms of any further actions that will be taken, I need to meet with the substitute and investigate further. But, I assure you that we take this very seriously."
Mum Allison Meyerham called the revelations "damaging".
"Stuff like this — that their parents lie to them — is damaging to kids," she told Brooklyn News 12. "It's three weeks before Christmas! These kids are 6 years old!"