Grampa relieves his Air Force days on The Simpsons. "Let's Go Fly a Coot" is the 20th episode of the shows 26th season.
Added:
Homer finds out that Grampa was once a famous wrestler on The Simpsons. "Gorgeous Grampa" is the 14th episode of the show's 24th season.
Added:
It's that special time of the year on The Simpsons. Look for the family to see its future on the episode "Holidays of Future Passed."
Added:
A picture of Abe Simpson, aka Grandpa Simpson, Homer's rambling, senile father on The Simpsons.
Added:

The Simpsons Quotes

Homer: (Wearing glasses) The sum of the square roots of any two sides of an isosceles triangle is equal to the square root of the remaining side!
Man: (From inside a bathroom stall.) That's a right triangle, you idiot!
Homer: D'oh!

Son, a woman is a lot like a... a refrigerator! They're about six feet tall, 300 pounds. They make ice, and um Oh, wait a minute! Actually, a woman is more like a beer. They smell good, they look good, you'd step over your own mother just to get one! But you can't stop at one, you wanna drink another woman!

Homer