Many of the messianists in the video posted below appear to be Israeli.
They're reacting a charity distribution the Rebbe used to do almost weekly, just as they reenact kos shel bracha, the giving of wine by the Rebbe, the giving of honeycake by the Rebbe, and the daily coming to and going from prayers by the Rebbe.
The problem is, for these extreme Chabad messianists, they really believe the Rebbe is there and that he is alive.
You can see that when some of the messianists back away from the podium and bow slightly as leave.
The man at the podium is filling the role of one of the Rebbe's secretaries, who would slide a dollar bill toward the Rebbe, who would pick it up and hand it to the hasid as he gave the hasid a blessing. That would be repeated thousands of times each session:
[Hat Tip: Burich.]