here) does, in fact, exist! It was created for Mr. Bean (who else?) for the episode that aired on December 29, 1992. If you want to see the circumstances that led to the institution of the Christmas Sandwich, click the image on the right; it will lead you to a YouTube video.
The video begins on Christmas morning, so the first 1 minute, 50 seconds are spent opening gifts unrelated to the dinner.
And no, I did not stay up until this time watching Mr. Bean.
B– b– but that's okay, because we're on vacation!