I CAN'T TELL A LIE
A grandmother was looking after her two little grandchildren, a 7-year-old girl, and a 5-year-old boy, and both these children had been very, very naughty.
As the time drew near for their mother to pick them up, the little girl asked, "Are you going to tell Mummy how we behaved?"
The grandmother replied, "No, I'm not. But if she asks me, I can't tell a lie."
The little boy looked up to her and said, "Why not? I'm only five, and I can lie great."