Heres my ideas: Get a crane, have it drop its magnet wherever, the bar thing, misc. explosives, and an odd idea, dunno if it would work: You know those gumball bachines that when you guy it it goes through the sequence of rods having it run all of the place...? id like to have a button activate a barrel being deployed on a track that rolls it to key spots. sure, people would just shoot it, but i think itd be neat.