Little Miss Muffet

Last month, Cinderella was learning a lot about Nursery Rhymes in school.  So we heard a lot of them here at home.
One of these was "Little Miss Muffet".  For those of you not familiar with this rhyme, here is how it goes.

Little Miss Muffet, sat on a tuffet, eating her curds and whey.  When along came a spider, who sat down beside her, and frightened Miss Muffet away.

Then Guy asked us "Why would a spider come down and freak out someone who is eating?"