"Crystal Ball" joke

Rich is trying to sell a computerized crystal ball he's recently invented to a marketing executive, but the executive is very skeptical.

Rich says,' Go ahead and type a question into the crystal ball.'

The executive types,' Where is my father?'

The crystal ball answers,' Your father is fishing in Michigan.'

The executive says to Rich,' I knew this was bullshit. My father's been dead for twenty years.' The inventor says,' Ask the question in a different way.'

The executive types in,' Where is my mother's husband?'

The computer answers,' Your mother's husband has been dead for twenty years. Your father just landed a three pound trout.'