It must have been the mistletoe
The lazy fire, the falling snow
The magic in the frosty air
That feeling everywhere
It must have been the pretty lights
That glistened in the silent night
It may be just the stars so bright
That shined above you
Our first Christmas
More than we'd be dreaming of
Ah, Saint Nicholas had his fingers crossed
That we would fall in love!
It could have been the holiday,
The midnight ride upon sleigh
The countryside all dressed in white
The crazy snowball fight!
It could have been the steeplebell
That wrapped us up in its spell
It only took one kiss to know
It must have been the mistletoe!
Our first Christmas more than we'd be dreaming of
Ah, St. Nicholas must have know that kiss
Would lead to all of this!!
It must have been the mistletoe
The lazy fire, the falling snow
The magic in the frosty air
That made me love you!
On Christmas eve our wish came [bad word] 
That I would fall in love with you
It only took one kiss to know
It must have been the mistletoe!
It must have been the mistletoe!
It must have been the mistletoe!