I came across this neat little tool/toy on Kickstarter: https://www.kickstarter.com/projects/699604098/gravity-hook-a-high-performance-grappling-hook/description
My effort in showing it here is not to steal their idea but to expand on it(Yes, I am a backer of them today for their new keychain version).
QUAD COPTER USE: I can see all sorts of little retrieving claws from quad copters… what if that was a Oculus rift game? To see who could retrieve the most objects in a race. Or what if they were actually used for a reason? Like to explode mines or to deliver or retrieve medical items in a hot zone?
ROBOT USE: Or little plastic robots that use the hinge technique to move their legs. All you would need is a arduino and some servos. There once was this little wooden desk toy I saw:
I saw a larger version where the inventor Theo Jansen let it wander a beach.