After 10 years, the wife starts to think their kid looks kinda 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 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…”