
http://youtube.com/watch?v=oclNvH82-Kk
Yeap ,Ceres asteroid(15 Km) could cause something like this,Remember the earth is the biggest rock (a solid)in the solar system,and it has a powerful gravitational field, But there are details not showed here:
The surface of the earth would firts lift the surface of where is going to strike and when the asteroids reach 50.000Km.
I mean the problems will began before even get to strike us...yes, this could happend..
No in our life time neither our sons and our grandsons, all the trayectorys of these hudge object are well known,it wont happend,for at least for the next 10.000 years..
Amazed by this impressing video I decide to make a small animation my self a quick one to gave the idea how should the surface of the earth would lift..

Me

http://www.youtube.com/watch?v=tiQQpzqn8nc