I'm looking for another idiom similar to:
not have the faintest idea
It should be able to start a sentence. For some reason I want to use "by the stars" but I don't think this means anything, but if it did, the sentence would look something like this:
By the stars I have no clue how he came to that conclusion.
I guess the idom would more so mean "in utter confusion" like:
In utter confusion I have no clue how he came to that conclusion.