Don't Touch My Muffins

Teacher: If you have 10 muffins and your friend asks for 2 of them, how many muffins would you have left? Me: 10 Teacher: Okay, let me try again. You have 10 muffins. What if your friend takes 2 of your muffins, how many would you have left? Me: Still 10 muffins... and 1 injured friend.