So about 20 minutes ago, my brother and I were sat at the PC, and this irritating blue bottle started buzzing around.

He whacked it with a magazine and its head fell off, right in front of me. We blew the head away and the fly was gone...

...Then, as I type, the headless fly is lying on my floor, walking and buzzing around, hitting into things. Its calmed down slightly, but what the fuck?