Now They Grow Up to Be Flying Rats

Older woman: Mice grow up to be rats. I have mice.
Older guy: No, they don't!
Older woman: Yes they do, mice grow up to be rats.
Older guy: No, they don't! They're different species. They're cousins.
Older woman: No, they aren't!
Older guy: Yes, they are--they're cousins, like rabbits and squirrels.
Older woman: No--mice grow up to be rats!
Older guy: No, they don't! There are even different species of rats. German rats,
Norwegian rats...
Older woman: Okay, let's change the subject--I hate rats.
Older guy: Do you know pigeons have strokes?
Older woman: What?
Older guy: Pigeons have strokes. They don't last long, but they do.
Older woman: Uh...okay.
Older guy: Pigeons learn to fly when they're five weeks old.

--A Train