Syringe as a Weapon

Using a Syringe (Hypodermic Needle) as a weapon.
Two successful methods have been used by assassins-
1) Using a Syringe filled with Potassium Chloride, this is more readily available than one might think.
2) An empty Syringe pushing air into an artery such as in the neck.
Note: Syringes are now available everywhere because of the disposable syringes used by people with sugar diabetes. Just get one out of a trash can.