Playing with Grandpa

A sister and brother are talking to each other when the little boy gets up and walks over to his Grandpa and says, "Grandpa, please make a frog noise."
The Grandpa says, "No."


The little boy goes on, "Please .. please make a frog noise."


The Grandpa says, "No, now go play."


The little boy then says to his sister, "Go tell Grandpa to make a frog noise."


So the little girl goes to her Grandpa and says, "Please make a frog noise."


The Grandpa says, "I just told your brother no and I'm telling you no."


The little girl says, "Please .. please Grandpa make a frog noise."


The Grandpa says, "Why do you want me to make a frog noise?"


The little girl replied, "Because mommy said when you croak we can go to Disney World!"