Three young boys were boasting about their grandpas. The first boy said: "My grandpa is a great swimmer. He can swim for hours before getting out of the water!" The second boy said, "That's nothing. My grandpa always goes swimming at 6:00 in the morning every day, and only comes back at 9:00 pm because my mom says he has to!" The third boy says, "Your grandpas are both bad at swimming! My grandpa started swimming in this pond 20 years ago, and he hasn't come out since!!!"