http://thesims2.ea.com/community/holiday_greeting.mp3
I saw this the other day when it came out on The Sims 2 site, and I thought it was hilarious. If you're interested, here are the lyrics so you can sing along:
Dombi jow-jow fay-bie parnips
Fa la la, la la la, la la la.
Tru-be ar-va you-blee carnip
Fa la la, la la la, la la la.
Sim be var-sa, o-ba glor-ven
Fa la la, la la la, la la la.
Nee-ba tobin wib-ney vor-bin,
Fa la la, la la la, la la la.