Is getting hit by Perishables/Food worse?
Perishables are worse because kokeshi is a solid wooden item and does not stain or make your hair dirty, whereas salmon would smell, and soil the hair. The joke is in the fact that she mentions the possibility of something like salmon falling on her head right before it happens. She mentions that because it is very unlikely that any object would fall from the sky and hit one's head, and it happens twice in a row, which is supposed to add to comic effect.