I think that physicists are too quick to claim that “the laws of physics break down” when they cannot explain something. For example, any discussion that involves the concept of a singularity is immediately followed by the disclaimer that the laws of physics must break down. This sounds like an excuse rather than a scientific fact. However, there might actually be conditions which are so far removed from our knowledge that it appears as if the known laws of physics break down. For example, today we have no explanation for dark energy. Is this a case of the laws of physics breaking down or a case of no one suggesting an answer using known laws? Can you comment or offer any examples which seem to imply that the known laws of physics are so inadequate that they appear to break down?