Dogs get about fifteen years and spend every one of them excited you walked in. Learn something from that.

A short life, and not one second of it spent playing it cool. There is no grudge carried over from yesterday and no calculating whether you have earned the greeting. People mostly lose that by learning to manage how they come across, and they call the result maturity. Often it is just a fear of looking too pleased to see somebody.

Greet one person this week the way you actually feel about seeing them. Your mom when you get home, a friend at the bus stop, whoever. It will feel like slightly too much for two seconds, and then you will see what it does to their face.