"Wow this is so cool, I wish I could control the sea like you dad!"
"This will not sit well and they shall be punished!!!"
"Oh mighty sir, I've heard word upon the villagers that they've disobeyed you."
Once there was a calm ocean with no waves, everyone lived in peace with little hassle, life was good.
Imma kill you all!!!
One day Poseidon was teaching his son Triton how to control the sea so his legacy can be carried on. They weren't harming anyone because they were in the depths of the ocean.
Hermes came on one particularly cold day in summer and delivered a message, it read "The people of the beachside village are angered at the frigid temperatures of the water and are visiting lakes now as they are controlled."
"And that's why you respect your above and pay homage to your savior."
Poseidon was enraged at this remark and said: "Cause havoc to their city to show who's boss." With this Poseidon sent his pet Tsunami off, which are so powerful that when they swim they bring 100 ft waves with them.
The waves hit land so hard that every building in sight was lost in the currents everywhere, people were drowning and whole forests were brought down. The citizens never quite rebuilt everything back and all was lost.
And since that day, the people are paranoid of Tsunamis and how Poseidon can release one so easily. Nowadays the villagers obey the sea by fishing, tending, washing and relying on the ocean for their lives. Poseidon rest happy knowing he's scared them into subjects of him. The moral is, respect your savoir/boss because if you don't, it could backfire!