The term unprofessional is often used to characterize sur-
prising and threatening behavior. Anything that upsets the
weak manager is almost by definition unprofessional. So pop-
corn is unprofessional. Long hair is unprofessional if it grows
out of a male head, but perfectly okay if it grows out of a
female head. Posters of any kind are unprofessional. Com-
fortable shoes are unprofessional. Dancing around your desk
when something good happens is unprofessional. Giggling
and laughing is unprofessional. (It’s all right to smile, but not
too often.)

Conversely, professional means unsurprising. You will be
considered professional to the extent you look, act, and think
like everyone else, a perfect drone.