Have you never noticed that if you fire a medium speed moving shot (alch guns, blaster) while waving your cursor like a [dolt], your shots sometimes magically changes trajectory in mid-air. Sometimes it's just a little bit, but I've managed to cause the bullet literally make a sharp 170 and fly off into a different direction.
It's pretty pointless but amusing nevertheless
You can do it with the Revolver too, though it's harder to do so. I have a theory that this is hinting at a cameo from the Wanted movie ingame.