Who would have thought Bill Self had this in him?
The answer to the previous question, "Who would have thought Bill Self had this in him?", is nobody. Nobody thought, or wished, or nightmared, that he had this in him.
Incidentally, the correct answer to all of the following questions is also nobody:
Who thinks this is a good idea?
Who is Bill's publicist?
Whose eyes are still in working order after viewing that?