Guide: Many interesting and important things have been put into boxes over the years:

Guide: Many interesting and important things have been put into boxes
over the years: textiles, other boxes, even children's candy.
Milhouse: Do any of these boxes have candy in them?
Guide: No.
Milhouse: Will they ever?
Guide: No, we only make boxes to ship nails. Any other questions?
Martin: When will we be able to see a finished box, Sir?
Guide: Well, we don't assemble them here -- that's done in Flint,
Michigan.
Bart: Have any of the workers ever had their hands cut off by the
machinery?
Guide: No --
Bart: And then the hand started crawling around and tried to
strangle everybody?
Guide: No, that has never happened.
Bart: Any popped eyeballs?
Guide: I'm not sure what kind of factory you're thinking of; we just
make boxes here.
-- Q&A at the box factory, "Bart Gets Famous"