At work I try to talk to everyone with a smile, and those who bring a smile to me always make me feel better. Most of the people I work with are the same way (at least when dealing with customers).
Then there are the people who are grumpy and no matter how much I smile and try to be good natured about their complaints, just won't back down with their bad mood. People should realise that just because something annoys you, it doesn't mean you now have an excuse to take it out on those who are trying to help you.
I know I probably can't talk, but I've realised in the past few days that kindness really does make a difference.
You (this means me, you, everyone) smile at someone, you make them feel good. They smile back, they make you feel good. And vice versa.
This could keep going until you both explode in a shower of kindness (or Sprite).
Anyway, I should try to smile more and be kinder. So should you.