Keep calm & carry on - Part II

from National Lampoon's
European Vacation

You can't get a more stiff upper lip than Eric Idle, particularly when he's suffering at the hands of Chevy Chase. It is the quintessentially British trait. As the home of Uncool Britannia, the Sterling Times, notes,

Keeping a stiff upper lip is pretty hard to do and that's just the idea behind it. When someone gets upset, his lips usually tremble. Keeping a stiff upper lip is supposed to hide your emotions. This expression dates back to the 1800s, but is still used today. So why just the upper lip and not the lower? Well, most men of the era had mustaches and a top lip was more noticeable if it was quivering.