Guide to a variety of unusual magical situations and spells.
One of the books that Harry, Ron, and Hermione examined while preparing for the second task. It was the last book Hermione consulted before the Weasley twins arrived to escort her and Ron to see McGonagall prior to the task (GF26).
The book apparently discusses a spell for growing one's nose hair into ringlets, although we are not told whether that was a weird wizarding dilemma or a solution. (GF26)