Yeah, definitely an outside kind of tool.
You put one up the pipe instead of something like rock salt, as your first round for when you're stepping out on the porch to confront some rowdies. Particularly at night. They start coming at you and you let fly in their general direction I guarantee you it will get their attention.
If there are a few small brush fires you can deal with them after the perps have left the scene. Definitely not recommended for California or similar environments during dry season.
Can you get these rounds in a gun store? I definitely feel like trying one in my Mossberg.