[Governor Dinwiddie]

If this prediction occurs, then I will buy every Freeper a beverage of his or her choice.

The forces exerted by the planets are insignificantly small, because gravitational force obeys the inverse square law. And all the planets’ mass combined is insignificantly small compared to our sun. Our own moon exerts magnitudes more force upon the earth than all the planets combined.
 

[zeugma]

If this prediction occurs, then I will buy every Freeper a beverage of his or her choice.

You're looking at this wrong. It is extremely likely that there will be earthquakes of greater than 4.5 mag on any given day. I could make the exact same prediction for my birthday, and would most likely be right.