Nothing, it was a joke. Mom would say something, and you'd selectively pretend not to hear her.
Mad-Eye was the day we moved Harry from the Dursleys to the Tonks' for hiding when he came of age. I wasn't there, I was waiting for them all to come home safe - F-Fred and George and Ron and Bill and ... well, Fleur too, you won't know of her at all. George came back without an ear, and Mad-Eye didn't come back at all.