SF Parent #1: Does your nanny only speak Spanish with your child?
SF Parent #2: No.
SF Parent #1: Oh, that's too bad. A missed opportunity.
SF Parent #2: But the funny thing is, the cat is terrified of the vacuum cleaner, and she can't tell the nanny and housekeeper apart, so she's scared of both of them.*
SF Parent #1: Oh, I see.
SF Parent #2: Yeah. We're teaching the cat Spanish, so she can distinguish between the two.
*This is a bonus story.