I'm trying to say something like
"X has something to do with Y (which I don't know what it is)".
Clearly, the expression in the parenthesis is awkward here. I'm trying to parenthetically modify the sentence by stating that I have no idea what Y is. I guess a less awkward way to say would be
"X has something to do with Y (which I've never encountered before)".
However, this does not exactly have the same meaning as what I'm trying to say. I'm trying to say that I have no idea what Y is. Anyone know a less awkward way to say this, while maintaining that original meaning exactly?