The answer is "This one from Wednesday's night episode," and the question is "What was the most awkward mid-show interview in Jeopardy history?"
Alex Trebek will rue the day he asked contestant Tom Kavanaugh how he planned to spend his winnings. Turns out Kavanaugh is working on a documentary about sweatshop labor around the world, including "the 8-year-olds who made your fancy suit there, Alex."
"Was that a too low? Was that a low blow?" Tom asked, as Trebek recoiled.
Is anyone else wondering who made Kavanaugh's dress shirt, though?
Update: Tom Kavanaugh elaborates in the comments.