Here is another credit card sized device that you can take with you anywhere to get out of trouble. The Credit Card Survival Spear is under 1mm thick, so you can easily fit it in your wallet. It comes with semi-permanent and permanent adhesives. The spear comes with two sections, which you can use to create flat spears. You can also slide them into each other to create one large spear tip.
Like what you see? GrimWorkshop is selling these for $18.95 at this time.