Books. Anything to do with books. As much as I like finding other types of information, I really love finding the books more than anything.
I had a conversation the other day with a patron about Fifty Shades of Gray. She'd heard about them and wanted to know if we had them. I told her we did, but there was a huge (over 500 people) waiting list. She laughed and said nevermind. I told her that they started out as Twilight fan-fiction, and she'd heard that, but just wanted to see what they were about (and if they were as awful as she'd heard). We laughed as she walked away.
Yesterday, I had a patron needing books for a book report. That was due in a week. And we'd had the book list for well over a month. Most of them were checked out, but luckily we had three of them on the shelf. One was an automatic 'no'. (Too long). Thankfully, the other two were acceptable.