Is Everything a Fair Game in the Universe?

Everything is fair game in the universe. Potons can interact with themselves indirectly, right? They can generate e plus e minus pairs, which can then interact back with them. Natrinos, like natrinos an interact with regular electromagnetic things through these quantum transformations. And a nutrino could indirectly interact with corks in the same way, or other stuff. Dark matter might be out there totally inert, unable to interact with anything except for gravity. We don't know if it's fair game or not. It could just be super rare.