[ Okay that gets him to laugh ]

It's not, it's not! But okay... I'll teach you the one I was singing before then!

[ But even though he says that he stays silent for quite some time. It takes him a while before he speaks again. ]

U-Um, every verse starts the same, s-so those lines are easiest to r-remember...

[ And then back to silence. If Poseidon looks at him he'll see that the green mer's face is growing redder and redder...

Until finally he just puts his face in hands.

...Yeah, he's more embarrassed to start than he realized he'd be. Why you gotta have stage fright around your dad, child ]