Well, it's all been said now. I'm generally okay with apostrophes, but invariably have to correct myself with there, their and they're. I am perfectly aware of the difference, but I have to think about it, and if typing nearly always get it wrong and have to edit.

As for pet hate: Supermarket checkouts with signs saying "Less than ten items" when it should be "Fewer than ten items". AAAARRRGGGHHH. I'm a mild mannered man, but it makes me want to dump my basket and go and shop elsewhere.