[After a brisk nap]

I think many people for whom English is a second language take spelling and grammar more seriously than native speakers, because we actually depend on the rules to help us write and read, while natives rely more on intuition. In contrast, I was never explicitly taught English punctuation. So not only do I place commas by gut feel myself, but if others punctuate incorrectly it doesn't bother me nearly as much. (Punctuation is quite flexible in British English, anyway--although somewhat more rigid in American.)