What is the humorous moment in chapter 6?

When they return, Mr. Radley is standing inside his gate, and Atticus is there with various neighbors. They hear that Mr. Radley was shooting at a "white Negro" in his backyard, and has another barrel waiting if he returns. Dill makes up a story about playing strip poker to explain Jem's missing pants, and Jem says they were playing with matches rather than cards, which would be considered unforgivable.