Ha! The Ottawa Roughriders CFL team got some American C-list "celebrity" to sing Oh Canada before a game. Dude forgot the tune partway through and so finished the song to the tune of "Oh Christmas Tree." Too funny!
Brian wrote:
When you get to the climax when everyone wants to show their patriotic fervor, nobody can hit the note. Compare to "Oh Canada" where the climax of the song is at a register everyone can sing.