If you train the audience to do this, they will understand it's a skill. If the audience groans at a suggestion, go back and get a different suggestion. This game can also be played with a panel giving the suggestions. If the audience feels the panel has failed, the panel can be replaced. Demand that the first 8 or 9 suggestions be positive and advance the story.
Player ask for step by step instructions.
Justification Get an occupation, situation, etc. One at a time players step forward and perform the world's worst whatever it is. Keep it moving.