Talk like a frog
The Grandpa replied "What?, I'm not going to talk like a frog!"
The little boy again asked, "come on, Grandpa talk like a frog please."
Grandpa again said "No! Go bother your grandmother."
The little boy finally gave up and left.
A little while later the little boy's sister came in and said "Grandpa will you talk like a frog for me?"
Grandpa of course replied, "NO!"
The little girl then said "Please grandpa will you talk just like a frog"?
Grandpa was very disturbed by now and said, "what is it with you and your brother, why in the world do you want me to talk like a frog?"
The little girl looked at her grandpa and said "Well last night daddy told us that when you croak we are going to go to Disney World."