Powder loads for the zombie motivator.
A small howitzer motivates teh zombies to be happy and cheerful.
If not, teh howitzer is fired.
If that doesn't motivate the zombies ot be happy and cheerful, then the dust bunnies get released.
(Have flushed them from the air ducts on the lab sub level. Dunno what they were doing in there.)
(Erase my last query...I'm slow tonight.)