dude A sees it at the same time. Dude B sees the lightning at the front first then the one at the back from his eye on the back of his head. because the train gets shorter (I think).
Who cares, even if you have sex with your cousin your baby won't turn out retarded. The first generation is fine and besides the blood is already diluted between your two. Put the win back into the wincest.
The thing is, the stereotypes all have some merit but the problem of racism is cultural. If I wanted to put down an Aboriginal person using words, most of my remarks would be racist, i.e. Aboriginal people cant support families better than a park bench, being drunk, make fun of them sniffing...