Superstimulii are typically ways in which organisms manipulate other organisms. Extra-strong stimuli evoke powerful reactions - sometimes against their owner's will and best interests. This makes them useful for those who seek to manipulate others.
A picture is worth a thousand words, so without further ado, here are some superstimulii:
Superstimuli are often used in marketing and advertising. The Daisy advertisement used a fear superstimulus relating to the end of the world for political ends. Environmental activists regularly invite people to help to save the planet. Highly attractive female models are used to sell many products.