She--shudders. "Don't even say that! I don't want one of those crawling in with me. My can is pest-free, protected by my patented anti-intruder smoke alarm system." She curls a wisp of pink smoke around her hair as she says this.

Really it's not patented, because she just puffs pink smoke at any nasty things to either scare them off or (for smaller things) gently push them out. At another time he might have found bunnies, though. She doesn't mind when their little twitchy noses poke in.