This is what happened during math.

Liz (a friend): *starts humming I'll Be Home for Christmas*
Me: *starts singing* I'll be home for Christmas....
Liz: *starts to sing too* You can count on me....
Both: Please have snow and mistletoe
Rest of class: *working and listening*
Both: And presents under the tree.
Teacher: *is gone*
Both: Christmas eve will find me...
Both: *finishes singing the song*
Teacher: *comes back*

That's what happened. We sang a whole song... Also

Liz: It's the most-
Me: HORRIBLE
Liz:Time of the year...
Liz: With the kids-
Me: All a killing
Liz:... Jingle belling...
Liz: and everyone -
Me: Yelling
Liz: ... Telling you be good of cheer..
Liz: It's the most
Me: HORRIBLE
Liz: (O_o) Wonderful time of the year...

That's seriously how it went the whole entire song.