I have read articles here at FR to the effect that very large deep earthquakes, such as the one that created the Indonesia tsunami, can shift axis and rotation by a tiny bit, less than 1 degree, and ultimately have huge effects on climate.
I could see a large meteor hit doing something like that as well.
There is no shortage of theories and they all have their adherents and furnish evidence, such as it is, to support them. I seem to recall the Bible describes an event, obviously during historical times, when the earth wobbled like a drunk! Eyewitness accounts??? Generally considered fairly reliable evidence. You make the call...