Pool Cue

Dad: How about this? A exorcism pool cue, you can use to beat the devil out of people. You know, you're playing pool, your opponent becomes possessed, you need an exorcism pool cue.

Me: You could have it blessed by a priest and it could be like a squirt gun, shooting holy water out of the end!!

Dad: Now that's just silly. Just silly. It could have a screw off cap on the end though, with a little compartment for holy water to splash on the possessed.