One of the simplest set-ups gets awesome results. These guys get a real train horn compressor with three horns, put it underneath the vehicle and go hunting. Hunting for the unsuspecting that is. They scare the bejesus out of kids, teenagers adults and basically everybody they encounter. As for a prank we think this one gets the best results without the least amount of damage, except um the busted eardrums of bystanders. Watch the most hilarious reactions to a train horn you have ever seen, the cool part about it is that most of them smile afterwards so no hard feelings there.