Well, we all know what bungie jumping is, and we all know what kidnaping is, so why the hell not mix them together!! Just pretend to kidnap one of the guys when he's out doing his usual thing, dont let him know its you, then as he is blindfolded and tied up, take him to a brigde (or anything bungie jumpable!). Then as he is still tied up and blindfolded, attach a bungie cord to him, without him knowing, and throw him off! And all the while he thinks he's falling to his death!
Stern, stern but fair.