“An extra effort will always bear an extra credit.”
“...'Loving children is what teachers do for extra credit. It's not the main assignment.' 'Seems to me that the extra credit is more important than the main assignment,' observed Cordelia.”
“It's no use going the extra mile if people don't expect it. You will never get extra credit for it. Just invest it on something else.”
“Extra miles, extensive preparation and exhaustive efforts usually show astonishing results.”
“Are you actullay thise stupid? Or are you just making an extra effort just for me?”
“Physics extra credit: What should you do if you are stuck on frictionless ice? Assume you are nude and there is no atmospheric resistance. While correct, the answer 'suffocate' will not earn the credit.”