Um.. lol?
I mean, it's not funny really. It probably hurt like a ...
But, seeing as she's more or less OK, I think it's safe to say... that was kinda funny to watch.
Strange, though, isn't it? You can tell from the video clip that the sidewalk was just totally paved over... nothing. Nothing underneath to support it. What the heck? Maybe the original surface underneath collapsed, leaving the sidewalk to hold itself up.

Out of all the unexpected things that could happen that day, she probably didn't imagine falling through the pavement.
Thats how it is for some cities in the US too....