I have come to Greece as a tourist. But when I was wondering alone I have come in contact with the sphinx. This time it has asked me a new riddle. The riddle is as follows
What is it or who is it that walked on four legs, then on three, then on two and then again on four.
I asked the sphinx for mercy, so it gave me permission to ask the question on Puzzling Stack Exchange. I asked the sphinx if he could give me a hint, so the witty sphinx gave me a hint to a condition: that if anyone down-votes my question, he would not spare me. Please people, I'm relying on you to help me go back home. The hint is:
Your answer lies within a movie.