You can take any category you want for any amount you want thanks to J! Archive, which catalogues every single answer-and-question pairing from every Trebek-era episode of Jeopardy. I took a look at the board for July 25, 2008, an episode I missed because I was launching this blog. (Remember "What is Omega Man?" and you'll do well on this board.) [via Mental Floss]
As always, we hope you'll share an awesome link or two in the comments. In the form of a question, please.