What's the fastest way to give someone a flat tire? Pull the valve stem.
Forget pressing the air inlet or puncturing the tires with a knife, the first method is slow and the second is darn near impossible.
Pulling the valve stem is quick and easy. All it requires is a pair of needle-nosed pliers.
1. unscrew the stem cap.
2. use the needle-nosed pliers to unscrew the brass center pin until it pulls free.
If you have the time, re-screw the center pin and replace the cap. This will help hide how the tire went flat in the first place.
"Air pressure is not a right, it's a privilege."
? Danger Ranger, Burning Man