Is it not amazing to see a 250 ton rock is standing in a slope from decades, what are you thinking it is fake or something? its true this rock is called Krishna's Butterball in Mahabalipuram and balancing itself at 2 sq. ft base, even natural disaster like Tsunami and earthquake and unable to move it, named by the Lord Krishna ball of water and also known as Vaan Irai Kal.
Many attempts were taken to test it but not even a single inch moved. Its like challengeing the gravitational force.