Children say the darndest things

From one of my mom's law school classmates:

They had prepared a child witness and put him on the stand. The opposing attorney interrogated the child, "Did anybody prepare you to testify today, or tell you what you should say?"

The child replied, "Yes."

"Who prepared you?" The child indicated our friend. There were a few tense moments as the attorney closed in for the kill.

"And what did she tell you to say?"

Said the child, "She told me to tell the truth, and if I didn't know, to say I didn't know."