How about a dog story?
Our black lab disappeared for long enough that we thought for sure she was gone. Then, surprise, surprise, she came back home. As the whole family was making a big fuss over her, delighted to have our baby back, my uncle looked across the room at the dog (currently sitting on her haunches, back against my husband) and asked, "er, wasn't your dog a girl?"
Um, not our dog after all.