There's One in Every Family

Little boy: Mommmmmm, I want a pet mouse.
Mother: No.
Little boy: Please? It can live in my room!
Mother: No! You know what will happen. I'll spend a hundred dollars on cages and food and toys, and Terry will just eat the bloody thing.
Pet shop worker to little boy: Is Terry your cat?
Little boy: No, my brother.

Pet Shop

Overheard by: Suitably Impressed