Brutus says this at least twice a year. Just like whenever Brutus loses his reading glasses and he finds them on top of his head he says "If they'd've been a snake, they'd've bit me." It's just something married couples tolerate about each other.
I wish the unknown colorist would've chosen a darker brown for the coffee. It looks like dirty water or Gladys already poured in cream and sugar and just stirred it around in the carafe.