Do you carry your real life manners onto the internet?

This question comes about after answering the one about jumping a queue that was posted the other day as it got me thinking about manners in general.

I think it is interesting how people can change when they are on the internet and become a completely different persona from how they are in real life, so do you have the same manners online as you do offline?

Clearly you cannot hold doors open or help an old lady across a busy road on the internet, but are you the type that can throw the toys out of the pram quite easily online unlike real life or do you still mind your p’s and q’s with emails, chats, message boards? Do you find that you hold grudges more on one than the other? Do you look at your behaviour later on and think, what a dork??