I thought maybe he was seeing another tree. - Juniper

So," I (Percy) said glumly. "We're going to get a ride from your brother, huh?" Artemis's silver eyes gleamed. "Yes, boy. You see, Bianca di Angelo is not the only one with an annoying brother. It's time for you to meet my irresponsible twin, Apollo.

No matter how many times Percy killed them and watched them crumble to powder, they just kept re-forming like large evil dust bunnies.

Now, as far as I knew, he (Luke) was still sailing around on his demon-infested cruise ship while the chopped-up Lord Kronos re-formed, bit by bit, in a golden sarcophagus, biding his time until he had enough power to challenge the Olympian gods. In demigod-speak, we call this a “problem.” - Percy, 'The Battle of the Labyrinth

He raised an eyebrow. "You claim not to know me? Of course I'm Thoth. Also called Djehuti. Also called--" I [Sadie] stifled a laugh. "Ja-hooty?" Thoth looked offended. "In Ancient Egyptian, it's a perfectly fine name. The Greeks called me Thoth. Then later they confused me with their god Hermes. Even had the nerve to rename my sacred city Hermopolis, though we're nothing alike. Believe me, if you've ever met Hermes--

When she kissed me, I had the feeling my brain was melting right through my body.

I got the feeling Poseidon really didn't know what to think of me. He didn't know whether he was happy to have me as a son or not. In a strange way, I was glad that Poseidon was so distant. If he'd tried to apologize, or told me he love me, or even smiled. it would've felt fake. Like human dad, making some lame excuse for not being around. I could live with that. After all, I wasn't sure about him yet, either.