There, Their and They're quiz.

I got 100%

I cannot really understand how native English-speakers can fail to reach this score, but I guess grammar is always going to be difficult, no matter the language.

Well as you'd expect for someone who spends 20 hours a day typing on Saddo's I got 100%

But the testers really annoyed me because of the their own terrible grammar!

Who in the hell starts a sentence with a lower case 'there' or 'their'?

100%

Although it's surprisingly easy to make mistakes when you can't type well and your concentration on spelling and grammar is limited.