Hallucination?

My youngest son and I decided to go out to lunch this afternoon. We ate, chatted... He ate his food including a chocolate shake then finished my food! (Teenagers!) But while still seated, from across the room, I heard a metalic voice say "patties"- something about flipping the patties? I'm not sure but I thought there must be a voice built into the grill. Clear as day it was but nobody seemed to own those words! Except... I asked my son if he could hear it - he could not. ? Then a confused yet stern "Mother!" From my son. All leads up to... You guessed it: was I hallucinating today?