Wife: Honey, I have something very serious to tell you.
Husband: What's up?
Wife: According to DNA test results, this is not our kid..
Husband: Well you don't remember, do you?? When we were leaving the hospital, we noticed that our baby had pooped.
Then you said: Please go change the baby, I'll wait for you here.
So I went inside, got a clean one and left the dirty one there.
Moral: Never give a man a job that doesn't belong to him.