Water and Beach Communication

Alright listen up, genius. You see, water can't talk. So when it's asked what it *said* to the beach, the punchline is that it didn't say anything. Instead, it "waved" like an ocean wave, which is also a pun because waving is what you do with your hand to say hello. It's funny because of the double meaning! It's a dad joke. And you, my friend, have the humor of a dad.