Fits on your key ring, no one will know what it is, just say its helps keep the keys in your pocket with its weight. It can double as a striking device.
If you deploy it, BE PREPARED for the hotness that's about to be ALL UP IN YO' FACE, especially if in a room or if the wind is blowing against you (try to position yourself down stream)
In your car? Keeps the biggest fucking can of mace you can find. I keep a gun and a giant can of mace in mine.