Even Dwarfs Started Small.
"While filming the scene where a van drove in circles with no one at the wheel, one of the actors was run over, but immediately stood up uninjured. During the flower burning scene, the same actor caught fire and Werner Herzog raced over and beat the fire out. The actor only had minor injuries from the fire. After these two accidents, Werner Herzog promised the actors that if they made it through the rest of filming without any more injuries he would jump into a cactus patch and allow the actors to film him doing so. The film was finished without any further injuries and the director made good his promise and dove into the cacti. Herzog has said, "Getting out was a lot more difficult than jumping in." (wiki)