Who signed....?

A Kentucky teacher was quizzing her students. "Johnny, who
signed the Declaration of Independence?"
 
He said, "Damn if I know."
 
She was a little put out by his swearing, so she told him
to go home and to bring his father with him when he came
back.
 
Next day, the father came with his son, sat in the back of
the room to observe.
 
She started back in on her quiz and finally got back to the
boy. "Now, Johnny, I'll ask you again. Who signed the
Declaration of Independence?"
 
"Well, hell, teacher," Johnny said, "I told you I didn't
know."
 
The father jumped up in the back, pointed a stern finger at
his son, and said, "Johnny, if you signed that damn thing,
hell, you damn well better admit it!"