“Let’s try to make him come out,” said Dill. “I’d like to see what he looks like.”
Jem said if Dill wanted to get himself killed, all he had to do was go up and knock on the front door.

– Harper Lee

To Kill a Mockingbird, Chapter 1. Boo Radley may be depicted as a monster who strikes fear in children, but the children have a curiosity about him and Dill suggests they try to make him come out of the house. He is reputed to only leave home at night to watch people while they sleep.