Hello citizens of Novalis. My race the Blarg have a small problem. Our planet has become so polluted, overpopulated and poisonous, that we are no longer able to dwell here. Though I, Chairman Drek, have a solution. Using highly sophisticated technology, which you couldn't possibly understand, we will be extracting a large portion of your planet and adding it to our new one. Unfortunately, this change in mass will cause your planet to spin out of control and drift into the sun where it will explode in a flaming ball of gas, but, of course, sacrifices must be made. Thank you for your cooperation.

And if you don't, you can take your whiny, sniveling, snot-nosed populations, form a line behind me, and kiss my... We're still on? Well turn it off, you idiot!

This could be a problem. Take care of it.