Question on his Facebook page:
Okay, so you're playing hold 'em and all cards have been dealt. As you begin the final betting round, you realize that you have the lowest-ranking hand that can't possibly be beat or even tied. What's on the board and what cards do you hold?
See here for his answer and explanation. But try to work it out for yourself first. It's a worthwhile brain exercise.
(I got it right. Did you?)