What's the difference in a light joke and a dark joke? Where they sit on the bus.
Are you trying to insinuate racial conceptions of color based seating?
If you think it's racial, then how about I put it this way. I hope the dark person who sat in that bus seat exploded.
Racial segregation is a thing of the past. Join the 21st century and adjust your views to the present. Stop being racist and treat your fellow man accordingly.