Yep. The best defence of all, I've found, is to look poorer and even more retarded than potential attackers. Smart thinking and a smooth tongue often outwits the halfwit. Fumbling for a one-off chance weapon is a ticket to an early grave. Come to think of it, I hope they get top sales in the US.
The French, of course, designed such a devious weapon ages ago. I wonder whether it was for the mess Webley shot on putting Gallic hand to brow on learning that half Europe has been shagging one's spouse whilst one was hiding in an outhouse.
You may have a point there, one thing the French are not famous for is brains, but one they are well-known for is invisibility. You may remember that the original Invisible Man was a chap called Claude Raines....how much more French? You're in a tight spot, look round for the French and Hey Presto!