You think that’s bad? Try stepping on one of these:

These are training mats for keeping pets away from things like doors. We have these by our front door to try to keep our cats from hanging out there. I’ve stepped on them a couple of times in stocking feet and it hurts like an absolute motherfucker. Those little spikes have absolutely zero give.
As for the cats, we’ve caught them laying on the mats and walking on them like it ain’t no thing. Little fuckers.