Tom Lehrer's "A CHRISTMAS CAROL" is too good not to be printed here complete. A classic.

Christmas time is here, by golly
Disapproval would be folly
Deck the halls with hunks of holly
Fill the cup and don't say "when"

Kill the turkeys, ducks and chickens
Mix the punch, drag out the Dickens
Even though the prospect sickens
Brother, here we go again

On Christmas Day you can't get sore
Your fellow man you must adore
There's time to rob him all the more
The other three hundred and sixty-four

Relations, sparing no expense'll
Send some useless old utensil
Or a matching pen and pencil
"Just the thing I need, how nice"

It doesn't matter how sincere it
Is, nor how heartfelt the spirit
Sentiment will not endear it
What's important is the price

"Hark the Herald Tribune sings
Advertising wondrous things..."

"God rest ye merry merchants
May you make the Yuletide pay..."

"Angels we have heard on high
Tell us to go out and buy..."

So let the raucous sleighbells jingle
Hail our dear old friend Kris Kringle
Driving his reindeer across the sky
Don't stand underneath when they fly by

Here's another version of "We Three Kings":

We three kings of Orient are
Tried to smoke a rubber cigar
It was loaded, it exploded
Now we are seeing stars

We two kings of Orient are
Tried to smoke a rubber cigar
It was loaded, it exploded
Now we are seeing stars

I one king of Orient are
Tried to smoke a rubber cigar
It was loaded, it exploded
Now we are seeing stars