When I was in HS we used to see a lot of semi's hauling loads of chicken guts from the processors over to the east of us.
The trucks would start out from the processor okay with the trailer full to the top, but covered with canvas. But as they headed down the highway the sun would start warming things up, and the load would start fermenting.
By the time the trucks reached town stuff would have starting swelling and bubbling up over the rim of the trailer and dropping in the road.
The visual and olfactory experience was quite spectacular.
