Do you know what this is?  

It's “self defense spray” for joggers.. aka MACE!   My wife got this when she was in college.  This weekend we were cleaning out a closet and came across it.   She was explaining how she'd never used it and didn't even know if it worked.    She then sprayed a tiny bit up in the air as she was leaving the room.   Bad Idea!   Within seconds I was coughing and sneezing uncontrollably.  (Of course, she was laughing uncontrollably from a safe distance)  It probably took 30-45 minutes to be able to breath comfortably again.  I can't imagine getting blasted in the face by this stuff.

Bloomberg / Contributor