School Homework

"I ain't done nothing for my homework, Miss Fairhurst," said Michael.
"Really? Well done, that's a first."
"Say what? Miss."
"You've just told me that you did your homework."
"No I didn't, I said I ain't done nothing."
"Michael, If you 'ain't done nothing' then you must have done something."
"Say what? Are you yanking my chain, Miss?"
"No, Michael, I'm not, so let me see your homework, right away."
"Seriously, Miss, have you been smoking some really freaky shit?"
"I ain't been smoking nothing," said Miss Fairhurst, as she winked at Michael.
"Ahh," said Michael, "I get it now."