Hi Lost - I know what you mean, but I don't have an answer for you. It's a good question, though - I don't know what is the physiological reason behind shuddering. If you're cold, then it makes sense (to increase blood circulation or something like that), but scary things can make a person shudder, too.

I'll see if I can dig up anything on the internet.

We are ALL going to be a-ok!