My eighth-graders used a lightsaber to help them remember the difference between positive and negative integers. I threw some simple addition and subtraction problems on the board and had them take turns walking along the number line, pointing with the lightsaber, as they counted off numbers to solve the problems. Everything to the left of zero was the Dark Side, and everything to the right was the Light Side. The Star Wars analogy was silly, but they had fun with it, and it helped them remember the difference.
If you teach math, and you don’t already have one, I highly recommend making a number line that the kids can see from across the room and posting it on the wall above your whiteboard. Physically walking along the number line really helps the kids get their heads around integers.
Foolish Wand-Waving 