Here's a dark one
A married couple was lying in bed one night, when the husband turned the wife and saif
"Honey, Billy looks different from our other 9 children, does he have a different father?"
The wife sighs, tries to look her husband in the eyes, a small tear flowing down her cheek, she sheepishly says
"....yes"
The husband holds gasps, he holds back his tears, he whimpers
"I... I just want to know... one thing... who is the father?"
The wife, sobbing all over the sheets, look at her husband and whispers
"You."