This is said to have been composed and sung for the DOJ Office of Legal Counsel’s Christmas party during the Carter Administration – let me know if you have a more accurate source:
you better be careful
you better not cry
you better not pout;
I tell you why.
Santa is knocking
your cellphone.He’s bugging your room,
He is reading your email,
he is keeping a file
and running tails.
Santa is knocking
your cellphone.He heard your voice in the bedroom,
Watching you outside the door,
If that doesn’t get the goods,
Then he would use provocateurs.So – you can’t assume
you are safe.
on christmas eve
He will kick your door.
Santa is knocking
your cellphone.
Here’s another version: