[This][1] book by Manfred Knebusch starts with the limerick

    *A Mathematician Said Who 
    Can Quote Me a Theorem that’s True?
    For the ones that I Know
    Are Simply not So,
    When the Characteristic is Two!*

It gives a uniform treatment of quadratic forms in all characteristics including two.

  [1]: http://www-nw.uni-regensburg.de/~.knm22087.mathematik.uni-regensburg.de/book.pdf