BART: No.
HOMER: Did you raise the dead?
LISA: Yes.
HOMER: But the car's okay?
BART & LISA: Uh-huh.
HOMER: All right then.
WILLIE: There, pretty as a picture!
(Zombies burst out and walk away.)
WILLIE: ACK! ZOMBIES!
(Looks back and forth, pats the dirt down.)
WILLIE: There, pretty as a picture!
I know this moment may not sound all that funny on paper, but considering the fact that the zombies burst from dirt that Willie has just freshly shoveled, I have to imagine he was burying bodies at the exact moment the zombie apocalypse began. I always knew Willie wasn't one to be trusted...
HOMER: To the book depository!
HOMER: So long, Washington! Eat lead, Einstein! Show's over, Shakespeare!
ZOMBIE SHAKESPEARE: Is this the end of zombie Shakespeare?
(It is.)
I'd point out how unlikely it is that all these people were buried in Springfield, but given Springfield's proud history of graverobbing, I think it's entirely possible they'd have borrowed all of them over time.
And now, for my favorite joke of the entire segment...