couple of years ago during summer at work, we had a wasps nest in the roof above the works canteen, they were finding their way through the air conditioning system and flying in through the ducts in the ceiling. Unlucky for them, there were a few bug zappers around on the walls, it was amusing watching the bliters flying into it and getting fried... made a mess of the metal guards as they wernt exploding or flying off that much, but sticking and buring on the metal.
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