I'm a big fan of the twat-o-tron at ifyoulikeitsomuchwhydontyougolivethere.com which produces fake crazy comments, along the lines of:
Oh god not this again!. I read in the Sun that Labour is denying our freedoms. All Englishmen should string them lal up. No doubt this is illegal under theeu human rights cat!
What_happened_to_my_country Welwyn Garden City
Are there any other similar automatic comment creators like this?