In the world of quality airguns, there is a competition called Field Target (FT). In FT you shoot at wood or metal silhouette animal targets that have a small circular kill zone on them. Hit the kill zone and the target falls. Pull a string to reset. Well someone has come up with a target that indicates a hit with LEDs for situations where a pull string is difficult (targets can be as far as 50yds away).
Here's a pic of some pull string type field targets:
By the way, for those who still think of a Crosman pumpup or Daisy Red Ryder when you think of airguns, you'd be surprised to discover a whole world of adult airguns that are ultra accurate and powerful. Straight Shooters is a good place to learn more.