Startling.
Since guys like
Roger from Training
day (the ones that have a gun hidden in the newspaper they're reading) are rare instead of common, I'd watch the noisy one trying to be scary before I'd watch the quiet ones reading a book, newspaper, or magazine, since the noisy one is the one that will
creep up from behind and shoot, split the back of your skull with a hammer,
cut you in half with a machete, or run you over and keep going, all while claiming it was in self defense or on accident.