It's basically the point and laugh of the 21st century. Or as we like to call it, Nelson Muntz-ing.
Kimmel encourages viewers to find things that are shameful (be they people or parking or anything really) and are making everyone's day worse, snap a photo while pointing a finger at them and share it on Twitter with #fingerofshame. And this is what they found.
The takeaway from this is, basically, don't do anything outdoors that you wouldn't want to be photographed and shared on the internet by Kimmel's army of shamers (whose definition of what is shame-able is broad and undefined). Nothing could possibly, right?
Via YouTube