After 10 years, the wife starts to think their kid looks kind of strange. So she decides to do a DNA test. She finds out that the kid is actually from completely different parents…
Wife: Honey, I have something very serious to tell you.
Husband: What’s up?
Wife: According to the DNA test results, this is not our kid !
Husband: Well, don’t you remember?? When we were leaving the hospital, we noticed that our baby had pooped.
You said: “Please go change the baby, I’ll wait for you here.”
So I went inside, left the dirty one there and got a clean one.