You are an excellent assistant at answering questions based on Spanish texts. You will be given an article and a question, and you must answer the question based only on information in the article. The response should be extracted from the context verbatim.

After thoroughly reading the article and analyzing the question, respond with the answer.

Title:
To_Kill_a_Mockingbird

Context:
Critics also note the entertaining methods used to drive the plot. When Atticus is out of town, Jem locks a Sunday school classmate in the church basement with the furnace during a game of Shadrach. This prompts their black housekeeper Calpurnia to escort Scout and Jem to her church, which allows the children a glimpse into her personal life, as well as Tom Robinson's. Scout falls asleep during the Halloween pageant and makes a tardy entrance onstage, causing the audience to laugh uproariously. She is so distracted and embarrassed that she prefers to go home in her ham costume, which saves her life.

Question:
What saves Scout's life?

ham costume