A hypothetical person could gather up about 10 boxes of microwave popcorn.

That peraon could then gather up as many microwaves as possible from the shelves.

He or she coukd evenly distribute the microwaves across the store. They coukd even place two or three around the HVAC intake ducts.

That nefarious individual could remove all filters from the HVAC intake ducts.

If lead to do so, the person could put 1 bag of microwave popcorn in each microwave.

Feasibly, they coukd also start each microwave on high for 60 minutes.

The anecdotal smell of burnt popcorn would permeate and last for months. If you think burnt popcorn wouldn’t be that bad, then I would wager that you’ve never been in an office building that was evacuated for the burning chemical smell of one bag of popcorn left too long.

Only works until the initial sludge is cleared. I would bet it would be relatively clear water by head 3.

Now, if you take that scissor lift and attach something that can rip the head off, attach the same thing to ALL heads, and then attach those to one forklift and drive out of the building… that would do it.