The Question at Breakfast

Mom: Hey kids, do you hear that sound?

Daughter: Yeah.

Son: What is it?

Mom: A siren.

Son: What's a siren?

Mom: The sound that firetrucks and ambulances make. I don't know which one it is though, I can't tell.

Son: It is a fire truck.

Mom: I think it is an ambulance.

Daughter: I think it is too.

Son: Fire truck.

Daughter: Ambulance.

Son: Fire truck.

Daughter: Ambulance.

Son: Fire truck.

Mom: That's enough.

(while mom's back is turned getting something out of the refrigerator)

Daughter: (whispered) Ambulance.

Mom: I said enough.

Daughter: How did you hear that?

Mom: Because I am mom.