SH [as he is blocking Shirley with his foot and she, undeterred, is hopping over it]: No! Shirley! Stop!
Me: What's she doing?
SH: She's trying to catch this centipede.*
Me: So? Let her catch it.
SH: She might eat it!
SH: WHAT IF IT'S POISONOUS?
Me: Cats have been eating bugs for a long time.
SH: We have to do the research on this.
* I did not know we had bugs in this house, although Shirley spends a lot of time staring at the basement carpet, which got soaked in June, thus creating a moist environment perfect for the growth of vermin.