Luke Skywalker and Darth Vader were having a lightsaber battle... ...and Luke is getting demolished. He knows that unless he does something drastic, he's going to lose. So, thinking quickly, he says to his opponent, ""Darth Vader, I know what you're getting for Christmas."" Darth Vader hesitates for a moment and says, ""How do you know?"" Luke responds, ""I felt your presents.""