A woman boarded a bus with her son. The conductor asked her, "How old is this boy?"
"Four," replied the woman.
The conductor then turned to the boy and asked, "How old are you, sonny?"
"Four," replied the boy.
The conductor said, "Well, I'll let him ride free this time. But I know what he's going to be when he grows up."
The woman asked, "What is he going to be?"
"Either a giant or a liar."