Barrette, who attended the game with his dad Daniel, mom Kaeiades Jardines, sister Jodie and brother Jessie, fired up the Canadiens with an impromptu rhythmic clap that each player joined in, then excitedly announced each player's name.
"I didn't prepare anything," Barrette said. "If I prepared something, I'm going to maybe mess it up."
The Canadiens scored three first-period goals but would eventually lose in overtime.
"They got the comeback at the end of the second, and everybody was saying to me 'You should go down in the room again,'" Barrette said. "It's ok. It was an amazing night."