Amateur electrician (half-)hour

A few days ago, my late-night reading session was disturbed by a very large, very loud Musca domestica flitting around the ceiling fan, determined to push its face all the way through the frosted glass of my new LED bulb to feast on its tasty electronic innards.

Bzzzzzzzzzz

Determined to take matters into my own hands, I grabbed a nearby handkerchief and began flailing wildly at the intruder. A few things happened at once:

1. The fly escaped between the spinning blades of my ceiling fan (really);
2. The handkerchief wrapped itself around the weighted end of the light's pull-chain;
3. The light went out with a crack (and I put up a blackout curtain at night, so it was very dark);
4. Something whizzed by my arm and crashed into the ground.