In a freakish superheroes-in-animals type incident on the 24th, your yappy type dog will start jumping from the ground to bite your Christmas decoration balloons. To avoid this, either place weights on his little feet to prevent him from getting to the required height, or fix a large hat to his head so he can't look up.

Avoid berry fruits for the first half of the month.

A trusted electronic calculator will start giving you the wrong answers from the 17th, however by the time comes to check your math after the 20th it will have corrected itself again.