Prepare for Christmas!

The boys and I were in the near by woods yesterday exploring what's there in the fall. On the way back we saw a man with a dog. He was a complete stranger to us, but like usual the boys didn't mind that.
-Hello, Joonatan said to him and Benjamin echoed "Hi" - with two-year-old's accent.
- Hi there, the man replied.
We were already on our way to pass by the man, but apparently Joonatan wanted to finish up the encounter with a greeting of some kind.
- Merry Christmas! he shouted.
Of all the greetings he knows he picked Merry Christmas. Silently I said to him: Well Joonatan, it's not exactly Christmas, yet. And before I noticed he fixed the mistake and shouted even louder than before: PREPARE FOR CHRISTMAS!