I tend to use pretty uninteresting bookmarks. Receipts, post-it notes, index cards – nothing special. The mark below, however, has some character. It has some shock value. Pull this out of your book and 80% of people will be repulsed (estimation may be off +-3 percentage points).
The only question is, what would be the best book to use it in? Based on the recent New Yorker article “The Lion and the Mouse”, I think we all know which book Anne Carroll Moore (A.K.A. Inventor of Children’s Librarianship) would have chosen to use it in.