Jackpots!
A good thing? A bad thing? A nonexistent thing?
Let me tell you what I mean by "jackpot." I mean exactly what the casinos mean: a surprisingly big reinforcer, delivered contingently. The key is in the word, contingent. To reinforce a particular behavior, a jackpot has to appear, and be perceived by your learner, while the learner is doing that particular thing you want. Not afterwards.
