The Simpsons Episode 7.22 Raging Abe Simpson and his Grumbling Grandson in "The Curse of the Flying Hellfish"

After Grandpa's old army buddy passes away, the biggest secret in old Abe's life is revealed. During the Second World War, he was a member of the Flying Hellfish, a platoon that included Mr. Burns and several other men. Seizing a Nazi mansion, the Hellfish stole some priceless paintings and locked them away. The agreed that only the last living Hellfish would get to call the stash his own. The only problem is, Grandpa and Mr. Burns are both still alive, and Mr. Burns would like to have the paintings now. Grandpa, with some help from Bart, escapes Burns' attempts on his life and finds the hidden paintings on his own. A violent confrontation with Burns ensues, but the paintings don't go to either aging Hellfish. Representatives from the government break up the fight and give the prized paintings to an obnoxious German guy who is the grandson of the works' original owner.