In the NES Teenaga Mutant Ninja Turtles game, you occasionally come across some sub-weapons. Most of them aren't really that useful, except for the Boomerang. The Boomerang is useful because if you manage to catch them after they're thrown, then you can use them again.

You can also use this property to your advantage.

First, have a Turtle with Boomerangs throw a few.

Then, before they come back, switch Turtles and have someone else catch them.

You could even transfer all of them to another Turtle with this method if you wanted to.