This reminded me of the time when I solved most of the problems in this book just for the fun of it: http://books.google.com/books/about/Problem_book_in_high_s

This reminded me of the time when I solved most of the problems in this book just for the fun of it: http://books.google.com/books/about/Problem_book_in_high_school_mathematics.html?id=NdJUAAAAYAAJ http://books.google.com/books/about/Problem_book_in_high_sch...