What was Auggie's reaction when he saw Mr. Tushman waiting for him at the entrance of Beecher Prep?

When Auggie saw Mr. Tushman waiting for him at the school's entrance, he giggled.

So when me and Mom arrived at Beecher Prep a few weeks before the start of school, and I saw Mr. Tushman standing there, waiting for us at the entrance, I started giggling right away.