Sorry, it wasn't on landmark, it was on quest, so don't try too hard to remember - it probably didn't happen :) On quest it was a few times a day, for a few minutes, to 'lift the energy', whatever that means. But I think also to get us into obedience mode, and to cause embarrassment because you feel pretty stupid suddenly trying to dance in the middle of a lecture.
Forum:
Large Group Awareness Training, "Human Potential"