Pesticide Sprayed on Passengers on Planes?
If you have never heard of a procedure called "disinsection" you aren't alone. If you travel internationally though, or have plans to in the future, you should Google up what's going on in planes out there. In a world environment where fears over Zika virus are more rampant and terrible than the virus itself, some countries have concerns about bringing in insects from potentially infected parts of the world and so they are beginning to require spraying of pesticides on airplanes, sometimes while passengers are on board.
USA Today explained the procedure in a helpful article and provided the link to the US Department of Transportation's information page, which lists which countries currently have such a requirement.