Noises

Three nights ago, my wife was sitting in her recliner reading blogs on her laptop.  Smiley was on her lap, looking at blog pictures of animals on Farmgirl Fare and laughing about something.

Something about my wife's laugh provoked the following conversation:

Smiley: You sound like a girl.
My wife: Why do I sound like a girl?
Smiley: You made a funny noise.
My wife: Do girls make funny noises?
Smiley: Yes.

Neither my wife nor I think her laugh is particularly feminine, so we are mystified.