I myself use an old aluminum baseball bat. I've practiced for a few years with it and never even swing it full on now that I'm inside a maze. I hold it high up on the head and use it in place of just my palm to make a nice crack against the wall or I simply drag it along behind me most of the time when I want to creep people out, and most expect me to have a pipe in my hands. When they see a baseball bat, a lot of people get quite nervous, setting up a scare from me or a scare from the guys in the next room. I also have an old rusty chain that I was using in a similar fashion, but that was actually too loud for me, though the benefit of that was the noise of a chain rattling scared or freaked out many people more than even the bat.