Actual footage of the experiment from Professor Solomon Asch, displaying how people conform their opinions to that of the group rather than risk ostracism. This is especially relevant in the time of corunka masks.
His work follows a common theme of Gestalt psychology that the whole is not only greater than the sum of its parts, but the nature of the whole fundamentally alters the parts. Asch stated: "Most social acts have to be understood in their setting, and lose meaning if isolated. No error in thinking about social facts is more serious than the failure to see their place and function."

Interestingly, Asch was the advisor of Stanley Milgram, who would go on to conduct a similarly interesting experiment. Both were Jewish.

(Also, lemmings jumping off cliffs together seems to be a meme and not based in truth.)