This is a classic. Player extends a small fishing pole over (or through a hole in) a screen. The operator in back of the screen attaches a prize to the line.
Fishing poles can easily be made from bamboo sticks or wooden dowels with a clothespin or paper clamp on the end of a string. Paint the screen with lively underwater designs for more fun.
Fish Out of Water: Attach a magnet to the fishing line. Players "fish" for fish with paper clips attached (see below).