This IIISSS Christmas Music!

My mom, Chris & I were listening to Christmas music on the way to work the other day. This song started, and my mother turned to me with a scornful look and asked:

Mom: "I thought we were listening to Christmas music?"
Chris & I replied, immediately and in unison: "This IIISSS Christmas music!"

If you don't get the reference, you need to watch DIE HARD again.

It is a scene between John McLaine and the limo driver, Argile.