This movie is about a rock that fell from space on a costruction site and a bulldozer ran over it. Making the bulldozer come to life and turning in to a killer machine.

Think you're looking for Killdozer.
Killdozer - opening and "trailer" - YouTube (http://www.youtube.com/watch?v=pVBSGXj7HrM)

Hi I am lookinf for a old movie with a guy goes to his sensi dojo and searches for answers and at the end he fights around water are something like that please somebody help me with this movie thanks .

It's a Karate movie