In an attempt to assimilate our one black pupil into the local population, we were all invited to his birthday party. Just before this event, our headmaster held a special assembly to explain why some people were black and some were white.
Everybody was born originally black, but because this was a dirty colour, God made a big lake and everybody had to have a wash in it. So, everybody came and bathed and washed off their blackness and became white.
But, the lake was drying up and so there was only enough water for some to wash their hands and feet.
A great story, for many reasons - its mindbending racism, for one. Also the implication that God just didn't bother refilling the lake, and thought "fuck it, let 'em stay black".