Two small boys talking about their dad joke

Two small boys, not yet old enough to be in school, were overheard talking at the zoo one day.

"My name is Billy. What's yours?" asked the first boy. "Tommy," replied the second.

"My Daddy's an accountant. What does your Daddy do for a living?" asked Billy.

Tommy replied, "My Daddy's a lawyer."

"Honest?" asked Billy. "No, just the regular kind", replied Tommy.