a joke ,

Johnny missed his final exam due to the flu, but he'd done so well during the year that the teacher suggested to the principal that they give him an oral exam to make up for the test he'd missed.. The principal agreed so they called Johnny into the office, explained, then the teacher asked, "Johnny what does a cow have four of, that I only have two of?" Johnny replied, "Legs." The teacher asked, "Johnny, what do you have in your pants that I don't have in my pants?" Johnny replied, "Pockets." The teacher asked, "Johnny, what is the capital of Italy?" Johnny replied. "Rome." The teacher turned to the principal and asked, "Should we pass him?" The principal replied, "Better not ask me, I got the first two wrong"

Aunt Bessie loved to visit her nieces and nephews. However, she had relatives all over the country. The problem was that no matter how much she enjoyed seeing them, she hated flying. No matter how safe people told her it was, she was always worried that someone would have a bomb on the plane. She read books about how safe it was and listened to the stewardess demonstrate all the safety features. But she still worried herself silly every time a visit was coming up. Finally, the family decided that maybe if she saw the statistics she'd be convinced. So they sent her to a friend of the family who was an actuary. "Tell me," she said suspiciously, "what are the chances that someone will have a bomb on a plane?" The actuary looked through his tables and said, "A very small chance. Maybe one in five hundred thousand." She nodded, then thought for a moment. "So what are the odds of two people having a bomb on the same plane?" Again he went through his tables. "Extremely remote," he said. "About one in a billion." Aunt Bessie nodded and left his office. And from that day on, every time she flew, she took a bomb with her.

I know that sometimes I am not to swift but I don't get it.