“Two U.S. Marine skeletons guarded the doors. They grinned down at us, rocket-propelled grenade launchers held across their chests."You know," Grover mumbled, "I bet Hades doesn't have trouble with door-to-door salesman.”
“I’m a door-to-door salesman. I sell doors. If I can’t knock on yours, because you don’t have a door to knock on, I know you’ll be interested in what I’m selling.”
“If I tell you I want to be a door-to-door salesman, don’t knock it. ”
“I never got to call myself a door-to-door salesman, because, regrettably, I only ever went to one door. But one day I just might knock on another door, to be able to proudly say that I was once a door-to-door salesman.”
“Aim towards enemy." - instructions on U.S. rocket launcher”
“I carry a door with me wherever I go, because one, it’s symbolic for the opportunities that’ll open up for me, and two, I want to be the best door-to-door salesman who sells doors, so I carry a sample with me everywhere.”