"The Asch experiments" refers to a series of lab experiments Solomon Asch performed on conformity — how are people influenced by others in a group? Throw a test subject into a group of people who are in on the joke and see.
The old “Candid Camera” TV show performed an Asch experiment for one of their episodes, seen here. It’s just a funny clip of confused looking people, but you might find it a little troubling to realize just how easily we humans can be convinced to stop thinking for ourselves and do something so obviously ridiculous.
By the way, all the cool kids are sharing this. Go ahead. You know you want to.