Via The Huffington Post:
“Authorities say a 74-year-old Boise woman arrested after pouring mayonnaise in the Ada County library’s book drop box is a person of interest in at least 10 other condiment-related crimes.
Joy L. Cassidy was picked up Sunday at the library, moments after police say she pulled through the outside drive-through and dumped a jar of mayo in the box designated for reading materials.”
Another source
Here is a news story from another source with one or two more details
http://www.myfoxdfw.com/dpp/news/061510-woman-dumped-mayo-in-book-drop-cops-say
Wonder if she was just generally crazy or if she had a beef with the library. Maybe upset about a fine?