Christmas the whole thing is based on pun on the Japanese spelling of "merry Christmas", which is "Merii kurisumasu".

Huh? What's that?

What do you mean? Have you forgotten what day is today?

Chestnut kuri

Vinegar su

Box masu

Well of course, if my name were "Mary" it would have been perfect...

If that's the case, I have an idea.

SMASH *MERII*

Chestnut kuri

Vinegar su

Box masu

Merii Kurisumasu / Merry Christmas