I've come across a guy on Youtube that has been approaching numerous JWs in public Cart Witnessing. Actually, calling it Witnessing is beyond a joke because most of the time they are just standing there and in the case of this Youtuber, they walk away in silence or turn their heads.
The Youtuber is not a JW and I don't think he ever was, he calls himself a Christian and I don't think he is affiliated with any particular religion.
There is one Video where he shows about 4 JWs standing on a square plate with a yellow marking on the edge, they each have their own plate.
I am curious as to why they are standing on these? A possibility is that it is some sort or rubber and provide some sort of safety benefit when standing for long periods of time.