Because then if he gets even more used to telling dad jokes, it will never end.
[Percy]
I don't think he is? I mean, I don't really know Hades from the dreams. Just Pluto. And only a little. But he and Meg know each other in the dreams and I don't remember her at all. Also he has these really strange creatures from his dreams and...well, I don't know. I don't think he's the same Hades. But you might be a better judge, knowing Hades rather than Pluto.