Abraham "Abe" Simpson is Homer's fatherly and commonly just referred to as grandpa on the show.  Despite being a decorate war veteran with some of the most impressive stories, Grandpa is commonly regarded as a loon and his stories considering rambling by the family.

Grampa Simpson Quotes

Grandpa: That's how I got my idea for a suitcase with wheels: from a commercial for a suitcase with wheels.

You're in the newspaper business? Something that's going to die before I do.

Grandpa
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The Simpsons Quotes

Comic Book Guy: You are acceptable!
Homer: Great, would you like to see me naked?
Studio Exec: Oh, there's no nudity in this movie
Homer: What movie?

I played hardball with hollywood, the closest i will ever come to playing a sport in my life

Comic Book Guy