2050:
10 year old: Grandpa, what is gasoline?
Grandpa: It’s stuff we used to put in cars to make them go fast.
10 year old: Faster than 45 miles an hour?
Grandpa: Yes, up to 200 miles per hour!
10 year old: Aw, Grandpa, you’re trying to fool me again!..........................
Grandpa: It's the stuff we used to light our house.
10 year old: What did you keep it in?
Grandpa: Quit asking stupid questions and go light the candles.