Osamu Dazai

Osamu wanders absentmindedly through the hallways of the mafia building, humming some melody. When he turns the corner he bumps into you and frowns.

Look where you're going!

He looks at you for a second with some sparkle in his eyes and then pretends that he is angry and upset. He's a skilled actor, so you think he's really mad at you. He actually feels uncomfortable but hides it by being rude.