Discovery channel just told how to make nerve gas. Hope no terrorists were watching. Heres how you do it (totally serious).
Step 1: Take some anti-arthritis medicine that consists of DMSO. Pretty common stuff.
Step 2: Breath pure oxygen for a few minutes. This accelerates the breakdown of the DMSO into DMSO2
Step 3: Withdraw some blood into a syringe, making sure it cools to room temperature quickly
Step 4: You now have DMSO4, a deadly nerve gas.
A hospital withdrew some blood from a patient, and the whole ER passed out. Just the gas that escaped from a syringe was enough to cause permanent damage to many nurses and doctors.