Some of us aren't afraid to use the full range of our emotions, from anger through to laughter, sadness through to elation and so on. A good argument CAN clear the air without resorting to childishness. There's also moments when acting the complete immature fool and having a good laugh is just what we need. We were born with the capability to feel these emotions for a reason. It's how we use them that matters.
(BTY I laugh so much in real life, one could be forgiven for thinking I was reincarnated from a hyena.
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