If two black holes were to collide, it is theorized that the violence of the collision would send ripples through space time, called gravitational waves. I'm wondering what would happen if a ripple of this sort was to wash over Earth? Obviously it would bend time in some way, and effect gravity as well. How would we perceived these effects and how would they differ throughout the world as the wave passed through us?
I know that this is entirely theoretical, but does anyone have an answer that can be justified in any way, or at least that makes a little sense?