The following videos are of a prototype autonomous combat vehicle currently under development by DARPA. It is not a little thing (6.5 tons) and they don't call it Crusher for nothing. It is designed to go around or go over any obstacle in its path.
This next video got some tunes to go with it.
A little more then halfway through this clip (1:30) you'll see what happens when Crusher gets excited.
Be afraid, be very afraid.