How to make a compressed air spit ball launcher

Ever had one of those days you were super bored at work? Love to tease your co-workers? Check out this awesome tutorial video on how to make a compressed air, spit ball launcher. Spend a few minutes following the instructions of this how-to video and you will become the coolest person in the office, and probably the most hated. All you'll need is a ball point pen and one of those compressed air cans for spraying the gunk out of your keyboard. A little bit of immaturity doesn't hurt either. Use this as inspiration for one of your April Fools Day pranks!