Really silly joke

A man wakes up on a desert island and there is nobody around. Then he notices his hand is dark red! He pulls up his shirt sleeve and sees that his arm is the same colour and the other hand as well. He checks his other arm and finds out that it is also dark red. So he pulls his trouser legs up and discovers his legs and feet are dark red also. He then shouts "Oh my God I've been marooned!" 
