Among the reactions we got were:
"Two sixths?" (from a ten- or eleven-year-old)
"One eighth?" (from a fifteen-year-old)
"Three fourths! Three fourths! Three fourths!" (from a very excited eleven- or twelve-year-old, who continued to repeat it emphatically even after being told she was right and being given extra candy for it)
"You can't put school on a pumpkin!" (from a seven-year-old, quite huffily)
"One half plus one fourth . . . I don't know what that is either." (from a parent, terrifyingly)
Susan helped many of the kids figure it out eventually, since only three of them got it without help. She did not help the parent, so I guess the parent still has no idea what the answer is.
If you missed it, also see last year's math-o-lantern entry here.