A woman takes a lover during the day while her husband is at work. 

Her 9-year-old son comes home unexpectedly so she puts him in the closet and shuts the door. 
Her husband also comes home, so she puts her lover in the closet with the little boy. 

The little boy says, "Dark in here." 
The man replies, "Yes, it is." 
Boy, "I have a baseball." 
Man, "That's nice." 
Boy, "Want to buy it?" 
Man, "No, thanks." 
Boy, "My dad's outside." 
Man, "Ok, how much?" 
Boy, "$25." 

In the next few weeks, it happens again that the boy and his mother's lover are in the closet together. 

Boy, "Dark in here." 
Man, "Yes, it is." 
Boy, "I have a baseball mitt." 
Remembering the last time, the man asks, "How much?" 
Boy, "$75." 
Man, "Fine." 

A few days later, the father says to the boy, "Grab your glove.Let's go outside and toss the ball back and forth." The boy says, "I can't, I sold them." 

Father, "How much did you sell them for?" 

Boy, "$100." 

The father says, "That's terrible to overcharge your friends like that, that is way more than those two things cost. I'm going to take you to church and make you confess." 

They go to church and the father makes the little boy sit in the confession booth and he closes the door. 

The boy says, "Dark in here." 

The priest says, "Don't start that shit again