[Hank watches him a second, wondering if it's time to gracefully exit the situation before the kid's head actually explodes.]

Yeah. My swimming's pretty shitty anyway, so. But I'll keep those tips in mind, thanks.

[The mermaid nods, looking doubtful but polite enough to let them swim badly if that's what they want to do. But she does have questions.]

Are 'slacks' something all men wear? What do you use them for?