10 or less
I know many of you don't have a firm grasp of english. I'm halfways there myself, english being my second language. Every day I learn something new.
Even so I'm sure you all know the type. There's people like Mr. Bullethead here in every language. The sort that will come after you for even the smallest grammatical mistake.
I was a bit like that myself until I realized what a pain the behind that made me :)