Well walking on the sidewalk in front of the daycare with my youngest two children, I hear behind me:
It’s not nice to step on them because of that. Besides, those are saw cuts not cracks!
In case you don’t get it, a child was stepping on the sidewalk cracks to break his mom’s back. But the dad did not appreciate it (mostly because, if it worked, he’d have 4 boys under 6 to care for on his own, I would assume).