After ten years a wife started to think their kid looked kind of strange, so she had a DNA test done. When the test came back, it indicated that the child was not theirs. When she told her husband, he replied "You don't remember, do you? When we were leaving the hospital the baby pooped and you told me to go and change him, so I went inside and got a clean one and left the dirty one there."
The wife fainted...
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:-)