Gas? You want to discuss gas?

There are two easily obtainable white powders which, when mixed and kept dry, do nothing but sit there. Add water -- even just a drop -- and a chemically "dirty" batch of chlorine gas is produced and quite a bit of it, too!

My Late Mother's Three Big Rules:

1. You will no longer make pyrotechnics, fireworks, or explosives of any kind in the basement or anywhere in the house.

2. You will no longer make lachrymators or other war (poison) gases anywhere in the house.

3. If you are going to experiment with electricity don't trip the breakers.

Each was promulgated immediately after A Certain Incident.