Contagious

Little Johnny's teacher is teaching class, and she's telling them that the word
of the day is "contagious."  She asks if anyone can use this word in a sentence.  
Several children raise their hands. "Very good," she says, "How about you Ray?"

Ray says, "My dad told me to stay away from kids with mumps, 'cause they're contagious." 

"Very good," says the teacher. Then she picks Suzie, who says, "The atmosphere was 
contagious," and the teacher says, "Excellent, Suzie!" 

Then she notices that little Johnny has his hand up, at the back of the class. "Yes
Johnny?" she says. 

Johnny says, "The other day, me and my dad's a-sittin around, and we saw our blonde 
neighbor painting her fence. She had a tiny little model car paintbrush, and she was 
going in tiny little strokes up and down the fence, and my dad says to me, 
"Jesus, it's gonna take that cunt ages to finish that fence."