I guess you don't have many popular black comedians in the uk... I'm only responding to this because Im giving you the benefit of the doubt that you being from the uk is why this thread even exists lol.
i've heard of it before. instead of asking here, you should ask black people on the street maybe a group of 5 or so. i've heard white people are black when the lights are off.
they do is it only when white people aren't around?