<grin> Even that method is prone to error, as David Hedison found out,
flying around the garden and getting stuck in a spider web, waiting for
Vincent Price to mercifully swat him after a fly hitched a ride into the
transporter chamber and heads got switched. "Help me! Help me!"
Bart Simpson's adventure was just as good when they used "The Fly" as the
basis for one of their "Treehouse of Horror" episodes. Even Jeff Goldblum's
turn at bat was interesting and now the hairs on my back *really* creep me
out and I don't like elbow macaroni much after seeing the baboon transport
gone horribly wrong.
But seriously, we had a fly problem at work, on the 16th floor of a building
without any fly troubles or obvious entry points (sealed windows).
The cause turned out to be a co-worker who brought in a house plant from
home that had been sitting outside for a few weeks in the summer, having
thousands of eggs laid on it.
I had the same experience, bringing in plants that had been sitting on the
front porch. I haven't made that mistake since. I even nuke potting soil
in the microwave now, because my little mistake ended up with more flys than
you can imagine. Each fly has the same iridescent green markings that
suggested they were all hatchlings from the same batch of eggs.
I learned a lot about the life cycle of the common house fly that year,
which can go from teeny gnat-sized (still the same shiny green color) to
large regular fly to giant old fly in a month. But mostly I learned never
to bring in a houseplant from the porch once it's been sitting out there
long enough to get covered with fly eggs (about 2 days will do).
Also, when very young, flies are quite small enough to pass through the mesh
of the average window screen and then grow so quickly they can't exit the
I knew a guy who was a "slobsophrenic". That's a crazy slob if you're
wondering. He wouldn't take care of his cats beyond throwing some food
on the floor for them. The cats would become ill and die under the
house. Flies would find any opening from under the house to come up
through the walls or any kind of crack in the flooring. It was very
strange and disconcerting to see flies come out of nowhere. It's quite
possible that you may have had some sort of critter die under your
house and it is now a mother ship for maggots.
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