Every person has one. Your EARS! when feel you feel the bass from 50 feet away coming from a persons car, you can generally assume the person in it is african american or just a wigger.
(Loud ass Bass sound)
1: what the hell?
2: Nigger alert, nigger alert
2: my nigger detector is going insanse right now!
1: OMG! you were right there they are in that car with the loud ass bass coming down the street.