The Yellow Jacket iPhone Stun Gun case
Since it doesn't look strange to be holding and using a cell phone, why not convert part of it into a defensive weapon? The Yellow Jacket looks like a thick protective case for your iphone, but it's actually a powerful stun gun. (And it also doubles the life of your iPhone battery.)
Yellow Jacket Stun Gun Tutorial
NOTE: No stun guns were traded in exchange for writing this post.
ALSO: Not once did I use the word "stunning" to make a pun.
Yellow Jacket Case>>