Catapults, or slingshots, are very popular on team building events, people see them as they approach the field and can't wait to pick them up to relive childhood fun and games.
A professional layout is set up using colourful targets and firing mini paintballs, which give a pleasing 'splat'.
This makes an ideal element in a round robin format where teams rotate around a collection of activities in round robin format on their away day. Other activities might include archery, quad bikes, laser clay shooting and so on.