Clearly, grammar is NOT fun, as mine seems to be the first post here. :-))
Then again, if you love grammar, try this online game:
http://www.english-online.org.uk/games/grofdoom/advisory.htm
Warning: not for the faint-hearted!
If you are worthy, you'll be allowed entry.
Once you get through the Courtyard, the next step is the Vestry of the Vampire Vowels, where you might get munched by the Killer Bat if you're not careful, but otherwise should be fine...
Good luck!