I saw Mommy kissing Santa Claus
Underneath the mistletoe last night.
She didn't see me creep
Down the stairs to have a peek
She thought I was tucked
Up in my bedroom fast asleep.
Then, I saw Mommy tickle Santa Claus
Underneath his beard so snowy white.
Oh, what a laugh it would have been,
If Daddy had only seen
Mommy kissing Santa Claus last night!
Lyrics taken from http://www.lyricsmode.com/lyrics/c/christmas_songs/i_saw_mommy_kissing_santa_claus.html