There may be some irony to be found in this human centipede.
Those sound funny; why would they make you sad?
I wonder if this does apply to the same magnitude in the real world. It's very easy to see this phenomenon on the internet because it's so vast and interconnected. Attention is very limited and there is so much stuff out there that the average user can only offer minimal attention and effort (the usual 80-20 Pareto allocation). In the real world things are more granular, hyperlocal and less homogeneous.