From a reader who may or may not wish to identify himself in the comments:
Les Glorieux were on fire tonight. The fans were pumped. By mid-period, people were already going hoarse form the cheering. They killed a 2 minute 5 on 3 and took it down the length of the ice and scored. Carey was a wall, a reinforced concrete wall.
The Prime Minister of our beloved country, Stephen Harper, appeared on the giant screen.
Instantly, the raucus crowd turned their deafening cheers to deadening boos like someone had flicked a switch. You could not hear a single word he said from the moment his face showed itself. Loud and sustained for the whole 60-90 seconds of his English message and then his French message and his obligatory nerdy thumbs up.
This seemed to me a very surprisingly angry booing. I was really taken aback. The anger was quite palpable. I've never been a part of something like that. I don't think your ordinary Montrealer likes our Prime Minister all that much.
Booing confirmed here.