At work, I am often accused of "blowing sunshine up people's butts." I will always end my emails with "Thanks!" and I expect a 'thanks' when I go out of my way to do something for you. You can bet your bottom dollar you will get a 'yw'. If you ask me to do something that is not my job or something I REALLY don't want to do, I will still tell you it's no problem at all. Some people think this is a waste of time, all this 'please and thank you' nonsense. I just don't. I think this is a necessity.
On my birthday, one of my sweet coworkers made me this cake, which is quite fitting. "happy birthday - may it be filled with rainbows and sunshine!" Too cute!