"I haven't the least idea.

She was all right till she got up-stairs here, and I turned on the lights.

Then she gave one shriek and--you know all I know." William advanced hurriedly.
"Billy, what is the matter?
What are you crying for ?" he demanded.
Billy dropped her hands then, and they saw her face.

She was not crying.
She was laughing.

She was laughing so she could scarcely speak.
"Oh, you did, you did!" she gurgled.