StoneByStone
It's OK to Be White
I can tell by the music, but also by how they look. If they look unemployable, they are lefties. If they are chomping gum with the mouth open, it is a lefty. "Bitch this and nigga that" in the music identifies lefties as well. The distortion from cheap stereo components is another dead giveaway that they are lefties. Righties turn the key off and take it with them when they vacate their vehicles.
I really hope you're trolling.