Never know when you need to branch out in new directions. Some possible directions. 10 Weapons You Won't Believe Are Legal http://www.thefiscaltimes.com/Media/Slideshow/2013/03/28/10-Weapons-You-Wont-Believe-Are-Legal.aspx
not to surprised by the list, as crossbows have been used by hunters and people with less then honarable intentions for centuries. Spearguns as well do very effectively in dispatching a fish as long as you know what your doing...If not your in for a nantucket sleigh ride.
Lived in coastal California as a teenager. Snorkle and speargun fishing was a regular activity. I was good for 2 to 3 minutes down time without problems, could push to 4+ if needed. Was young and dumb back then and pushed my limits. Got away with some risky stuff.
How about some of those compressed gas pumkin chunkers http://www.flickr.com/photos/67840039@N08/6328540543/in/photostream/
So how long until someone greets a SWAT team with a cauldron of boiling oil from second-floor window?
Which probably won't work to your advantage if they're on fire as they rush into your house, and you're stuck up stairs. We'll have to have a hot air balloon handy to escape the inferno.