An older brother in our hall gave some lame demostration with a lampshade and a lit oil lamp, ended up burning the shade to fine ash in an attempt to show us the effects that Satans world would have on our spirituality, in times of weakness.
Another brother was about to give the #4 talk on masturbation. Simply stood facing the audience, and in embarassment, stated that "he just couldn't do this", walked off the stage, and went home.