"I drove the broken horn straight into his side, right up under his furry rib cage." page 55. (when Percy was fighting the minotaur.)
Chapter 2 (character vs technology)
Ughh, the bus must have broke down.
"I turned just as the water blasted out of the toilet again, hitting Clarrise straight in the face" page 91. (when Percy blasted water out of the toilets and the water hit Clarisse and her friends.)
Chapter 3 (character vs self)
"Lightning. That was the only explanation. We'd been blasted right off the road." page 48. (when Percy's stepdad's car was hit by lightning and blasted off the road.)
Chapter 8 (character vs society)
"Black smoke poured from the dashboard and the whole bus filled with a smell like rotten eggs." page 25. (when the Greyhound broke down while Percy and Grover were riding in it.)
"I felt bad lying. I wanted to tell her about Mrs.Dodds and the three old ladies with the yarn, but I thought it would sound stupid." page 34. (when Percy lied to his mom about nothing happening at school.)
Did something scare you?
"Or I could defend myself against half the Ares cabin" page 120. (when Percy had to fight Clarisse and her friends during capture the flag.)