Gates

I switched coffee places recently (the old one was in a building that is about to be demolished!) and the one I go to now is a little free-standing booth that's manned by two Brazilian guys. They have a blackboard where they put every day a quote of the day. Today's was:

"It's from your unhappiest customers that you learn the most", and it's attributed to Bill Gates. Which is, when you think about it, hilarious.