And yet another difference between the first avant-garde and its more recent manifestations, is that the former actually were willing to die. The other? Not so much.
But about that teaching trick... I'm precepting (a.k.a. "TA"ing) this semester for an intro art history class, and at the session covering bibliographical resources, I underscored why internet sites are not suitable for formal research by altering a wikipedia file on the internet display in class, and then pulling up the site again with the incorrect information.
Of course I changed it back, but the point seemed to get taken.