Any type of long lasting gum like 5-Gum, Stride, Trident, etc. that you receive as a birthday present. When you chew that gum good luck will happen to you. Make sure you hide it in a safe place, remember you only have a limited amount so use it wisely.
Friend: You look like your having good luck today.
You: Yeah! I'm chewing birthday gum!
Friend: Wanna share some?