If you don't think too good, don't think too much.
My coworkers and I often discuss our home remodeling/repair adventures. This morning, a coworker described how a neighbor in his home town used a rifle to solve a common plumbing problem. I do not condone this approach and I am appalled at every possible level that someone would even try it.
His neighbor had to run a vent pipe (see Figure 1, vent pipe in red) from an interior room to the roof. Running a vent pipe requires putting holes in walls and floors so that you can run the pipe to the roof. Generally, I solve this problem by taking careful measurements, drilling unobtrusive holes to verify my location, etc.
My coworker's old neighbor came up with a unique solution. Why not just shoot a rifle vertically through your house to mark the path for your vent pipe?
My mouth dropped when I heard this.