Thalia and Nico were going up Half-Blood Hill, deep in conversation about My Chemical Romance and were passing Peleus's tree when Thalia saw Peleus in action. The guard dragon was peeing on her tree.

Her beautiful, magical, Christmas-scented, pine tree.

"PELEUS! Get OFF OF MY TREE!"

"Thalia, the dragon just needs to p-"

"No Nico! I will not have my tree covered in pee! I know how it feels! PELEUS RELIEVE YOURSELF IN A HOLE. NO TREE. DO NOT PEE ON THE PINE TREE."