A: This is actually pretty interesting. If I take a rubber band, right? Watch. One. Two. Three. It disappears.
B: Where did it go?
A: Rubber band heaven. There are always rubber bands lying around the office, so this should be really, really easy for you guys to do on the fly. Basically, what you need are a bunch of rubber bands, preferably size 19. These are a perfect size for them, and make sure they're the same color. This is what they call the camouflage principal.
Basically, there's a bunch of rubber bands on your wrist. You're going to take one, and you're going to give it a twist. You're going to pinch right here, between your hands, so it looks like you have a rubber band between your fingers. Basically, what it is, it's going around the wrist, and when you let go, it vanishes. It looks like this. It looks like you're grabbing a rubber band off your wrist, and you do a bigger motion. One. Two. Three. You let go. It disappears. Simple as that. One more time. Give it a twist. Hold it between your hands. Stretch it out a couple of times. It looks like a throwing motion. That's it. That's the secret for the vanishing rubber band.