This is the best one I know; unfortunately, the text doesn't do the parody credit. It's much funnier to hear than to read.

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The first thing at Christmas that's such a pain to me - is finding a Christmas tree.

The second thing at Christmas that's such a pain to me:
Rigging up the lights
And finding a Christmas tree.

The third thing at Christmas that's such a pain to me:
Hang-overs
Rigging up the lights
And finding a Christmas tree.

The fourth thing at Christmas that's such a pain to me:
Sending Christmas cards
Hang-overs
Rigging up the lights
And finding a Christmas tree.

The fifth thing at Christmas that's such a pain to me:
five months of bills
sending Christmas cards
Hang-overs
Rigging up the lights
And finding a Christmas tree.

The sixth thing at Christmas that's such a pain to me:
facing my in-laws
five months of bills
oh I hate those Christmas cards
Hang-overs
Rigging up these lights
And finding a Christmas tree

The seventh thing at Christmas that's such a pain to me:
the Salvation Army
Facing my in-laws
Five months of bills
sending Christmas cards
Oh Geez
I'm trying to rig up these lights
And finding a Christmas Tree

The eighth thing at Christmas that's such a pain to me:
I want a Transformer for Christmas
Charities and what do you mean - your in-laws
Five months of bills
Oh making out these cards
Edith get me a beer huh?
What we have no extension cards
And finding a Christmas Tree

The ninth thing at Christmas that's such a pain to me:
Finding parking spaces
Daddy I want some candy
Donations
Facing my in-laws
Five months of bills
Writing out those Christmas cards
Hang-overs
Now why they Hell are they blinking
And finding a Christmas Tree

The tenth thing at Christmas that's such a pain to me:
Batteries not included
No parking spaces
Buy me something
Get a job you bum
Facing my in-laws
Five months of bills.
Yo-Ho sending those Christmas cards
Ah geez look at this
One light goes out they all go out
And finding a Christmas tree

The eleventh thing at Christmas that's such a pain to me:
Stale TV Specials
Batteries not included
No parking spaces
I got to go to the bathroom
Charities
She's a witch I hate her
Five months of bills
I don't even know half these people
Who's got the toilet paper huh?
Turn on the flashlight I blew a fuse
And finding a Christmas tree

The twelfth thing at Christmas that's such a pain to me:
Singing Christmas carols
Stale TV specials
Batteries not included
No parking
aghhh
Charities
Got to make 'em dinner
Five months of bills
I'm not sending them this year - that's it
Shut up, you
Fine you're so smart you rig up the lights
And finding a Christmas tree