I received an e-mail regarding using wasp spray as a replacement for pepper spray. I'm attaching a Snopes review, which states generally that wasp spray works, and might work too well.
On this subject, I'm curious if there are any other household/barnyard chemicals that would work in a self-defense pinch, i.e. after I've fired all remaining ammo?
http://www.snopes.com/crime/prevent/waspspray.asp