An adult is a person who makes noise when they stand up.

Commentary:
"Ah, yes, the unmistakable sound of adulthood – a symphony of creaks and cracks! 🎶💥 Standing up is no longer a silent action, but a declaration of our presence in the world. Here's to all the noisy ninjas out there mastering the art of making a grand entrance with every rise! 🕺🔊 #NoisyAdulting"