Maybe They Were Dust Bunnies?

My boss walks over to me, holding a job ticket.

Boss: “You got this ticket to repair this computer?”

Me: “Clean it. The customer wanted it dusted out.”

Boss: “You returned it uncleaned?”

Me: “I did. The resultant required job was not as described by the client.”

Boss: “Huh?! Just how much extra dust was in there?”

Me: “Enough dust to almost cover the mouse bones.”

Boss: “…never mind. Good call.”