I was in a boardroom at work today when I saw Office Robot walk by. I witnessed someone saying hi and smiling at him, but he just kept walking like he never heard.
Poor Jenny-bot. She looked as flustered as a robot can look.
I've definitely done that exact same thing. Especially at work, you are usually in a completely other mental place and by the time you realize that you know the person in front of you they are past you and by the time you realize that they said 'hello' and smiled, you are ten cubicles away.
When I asked him later why he didn't smile at Jenny-bot, who has such a lovely robotic smile, he frowned and then smiled and agreed that her smile is lovely. Then he remembered a meeting he was late for and ran away.
In other non-robot news, I got offered a permanent position at our office today! I'm going to spend the rest of the night lying in a stupor of happiness and dreaming about being able to go to the dentist.