Too many fat people, SUVs and tall buildings getting the earth out of whaaaack. DUMBcRATs are working on fixin' it - ban everything, just leave abortions, homos, and tax the rich!
The danger is that huge ice mass in Antarctica. It is off center already, and it could start a wobble which would accelerate quickly. The new axis would form in days or less. If earth flips in half a rotation, the motion would make standing difficult.