The best line I've heard in my English class in a while came when I was teaching the girls how to write a paragraph. We were researching pumpkins (it WAS Halloween), but the example was about ice cream. The clincher, or conclusion, of the sample paragraph was, after talking about how good ice cream is, "No wonder we say, "I scream, you scream, we all scream for ice cream."
One of the brightest girls in my class had figured out that we were going to use the same format to write about pumpkins. She raised her hand.
"So we are going to write a clincher for the pumpkin paragraph as well, right?" she asked.
"Yes, of course."
"And could we say, "I scream, you scream, we all scream for pumpkins?"
It took me a while to get the class to settle down after the general hilarity of seeing their teacher crack up for a whole minute.