 En route they present the family with enormous amounts of food and watch eagerly as they gorge themselves, then check their weights, being particularly delighted at Homer's mass.Suspicious of the alien's intentions, Lisa sneaks into the kitchen and finds a book titled "How To Cook Humans".She takes the book and shows it to the aliens, who explain to her that part of the title was obscured by space dust, which they then blow away to reveal the title "How To Cook For Humans".