Literally littered

A.: Of the gazillion vacuum cleaners strewn across the house, could someone please tell me which one(s) work(s)?
Dad: The house is literally littered with vacuum cleaners.
Mom: He wouldn't know which ones work; he never vacuums.
Dad: That's because every time I try one of the ones on the floor, it doesn't work.
A.: There was a decent-looking one in the basement.
Mom: That one doesn't work.
A.: Which one works?
Mom: I'll find one.