Counterintuitive problem: Everyone in a room keeps giving $ to random others (decisionsciencenews.com)

It is interesting. The video does not play for me, but I made my own implementation (look at [0] to see it, in order to complain about any mistakes I may have made). I can see now what it is doing.

[0] http://zzo38computer.org/textfile/miscellaneous/givemoney.c