For years my husband denied he was an aggressive driver. That changed one day when we were out for a drive with our three-year old son, Matthew.

Seeing a teaching opportunity, I asked Matthew about traffic lights.

"What does a red light mean?" I asked.

"Stop."

"Good. How about green?"

"Go."

"And yellow?" I continued.

In his best deep-voice impression of Daddy, Matthew bellowed.... "Hang on!"