I believe the phrase is "to be hoist by one's own petard," and since everyone knows the rules I'm here for it. On the other hand, it's not against the law to have a sense of humor that is several degrees away from the ecliptic, and Jeopardy needs Jennings more than the other way around. I would be ever so happy to show Ken clemency if he were to demonstrate it himself, but he's made plenty of money and has passive income from book sales and the like--he can certainly afford to be abrasive.
/I would have gone to Officer Frank or Brad Rutter first, but I wouldn't choose them as permanent host.
//Nor would I have gone to Laura Coates.
///I'd have to know who she is first.