What does Percy do to Clarisse when she tries to stick his head in the toilet?

In "Percy Jackson & The Olympians: The Lightning Thief," when Clarisse tries to stick Percy’s head in the toilet, he retaliates by grabbing her hair and pushing her head into the toilet instead. This unexpected turn of events surprises both Clarisse and the other students, marking a pivotal moment in establishing the rivalry between them. However, it also showcases Percy’s growing confidence and willingness to stand up for himself.