On Twitter the hashtag #bookswithalettermissing was trending due to lots of people offering title suggestions. 

And even better, some of the best titles have a cover!  Twitter user @darth got creative with Photoshop and created jacket art for some of the best fake book titles, and you can see them collected at llustrating Twitter's #BooksWithaLetterMissing.

Find even more at Darth's blog.