diptera and writers

 Diptera and Writers
I was thinking of flies Wikipedia was no help
I wanted to understand why they existed, I remembered
a yellow fly not a good colour for an insect,
when I was disrupted by the thought of a famous writer
in Norway who at 75 decided to commit suicide.
He bought sleeping pills plenty of expensive champagne
and invited friends to witness his death.

For each mouthful of the stuff, he swallowed a pill, friends
just drank; finally, he fell asleep among empty bottles and
the smell of stale cigarette smokes his mates had gone home.
It despair he jumped out of the window land on an awning
and lived ten more years. As for the yellow fly it took to walking
across the screen I threw it out, but still don`t know what
flies are for other than annoying a writer.