This song should not work. It's a mashup of Trans-Siberian Orchestra's "Christmas Canon" and Blink-182's "All The Small Things" with lines from It's A Wonderful Life scattered throughout. It's called "It's The Little Things," and I love it.
The song is the creation of internet song-masher Voicedude and was featured on the online album "Santastic Four"—which, along with a tweet from Neil Gaiman, is probably why it has almost twice as many views as his next most popular video. (The video above, however, is not the original video. This one, which I prefer to Voicedude's, is made up of clips from the 1984 BBC children's miniseries Box of Delights, which I have never seen. Probably because I was not a British child in the 80s. Or a child of any nationality in the 80s, for that matter.)
By all rights, I should hate this song. I dislike Blink-182 in the same way I dislike everything that was popular when I was in elementary/middle school. "Christmas Canon" is a lovely song in its own right, but it doesn't entirely avoid the vague sense of boredom and disappointment that all former second violinists feel when hearing Pachelbel's "Canon in D." It's A Wonderful Life is just kind of boring. [ETA: I don't actually remember whether or not I liked It's A Wonderful Life. However, it's been pointed out to me that the first quote is from A Christmas Story, which I know I dislike. Go ahead, hate me.]
But there's something that makes this all come together. Don't question it. Just press play and let the weirdness wash over you as try to decide whether or not you like it. Eventually you'll realize that you've listened to it half a dozen times, which probably means that it's worked its way into your heart through some devious trick. Blame the Christmas magic.