Diproton
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A diproton is a hypothetical type of helium nucleus consisting of two protons and no neutrons. Diprotons are not stable under the existing laws of physics, since the electrostatic repulsion of the two protons' positive charges overcomes the strong nuclear force holding them together, but it has been speculated that if the strength of the strong force had been only 2% greater all protons would bind together into stable diprotons. This hypothetical situation has been called a "diproton catastrophe" since the behavior of matter would be radically different in such a universe.
Lacking a theory of everything to explain why certain parameters of the laws of physics take on the values that they do, the issue of how the laws of physics are seemingly "fine-tuned" for the existence of life as we know it as been raised in discussions of creationism and the anthropic principle.